Illinois Propane Price 2026: Cost Per Gallon, Suppliers & Delivery

Illinois residential propane runs $2.03/gal in 2026, roughly 24% below the $2.67/gal national average and 2% below the $2.07/gal Midwest regional average. PADD 2 storage proximity, downstate refinery LPG byproduct, and Mt. Vernon salt-cavern storage keep Illinois cheap. This is the no-spin breakdown: real supplier guidance, fill-by-tank-size math, LIHEAP via DCEO, OSFM regulation, and how the October corn-drying draw shapes downstate pricing.

Latest EIA residential propane price

Source: EIA Illinois residential propane price survey. Current data is the final release of the 2025/26 heating season (week ending 30 March 2026). EIA pauses weekly publication April-September; next release expected October 2026. Refreshed 26 May 2026.

Illinois Propane Pricing Snapshot (2026)

Illinois residential avg

$2.03/gal

EIA 2026 survey, full-service residential delivery

vs national average

-24%

National avg $2.67/gal. Illinois pays $0.65 less per gallon.

vs Midwest region avg

-2%

Region avg $2.07/gal. Illinois sits among the cheapest Midwest markets.

Annual fuel cost (1,000 gal)

$2026

Saves about $650 versus a national-average market

500-gallon refill (400 usable)

$810

Most common rural-home tank size in downstate Illinois

Pre-buy savings (May-Aug)

$200-$400/yr

Lock-in or cap-price contracts beat the October-November harvest draw

Illinois is one of the cheaper US markets for residential propane, sitting alongside Iowa, Kansas, Nebraska, and Texas in the lowest cost band. The drivers are structural: PADD 2 storage proximity, in-state refinery LPG output at Wood River and Robinson, the Mt. Vernon salt-cavern storage hub, dense supplier route economies along I-55, I-57, I-72, and I-74, and a large agricultural propane base that supports year-round volume.

Why Illinois Propane Prices Sit Where They Do

Illinois consistently sits in the cheapest decile of US residential propane prices. The drivers are structural and infrastructure-led, they will not erode unless major Midwest refinery output or storage capacity changes.

1. PADD 2 storage proximity. Illinois sits in the heart of EIA Petroleum Administration for Defense District 2 (Midwest), the second-largest propane stock region in the country. Williams Companies operates one of the largest underground propane storage caverns in the US at Mt. Vernon, IL, with rail and pipeline links to Conway (KS), Mont Belvieu (TX), and the Mid-Continent NGL grid. Illinois propane never travels far before it reaches a customer.

2. In-state refinery LPG byproduct. Phillips 66's Wood River refinery (Roxana, IL, Madison County) and Marathon's Robinson refinery (Robinson, IL, Crawford County) both produce LPG as a routine byproduct of crude refining. That puts physical propane volume into Illinois without any inter-state pipeline tariff, and it directly lowers wholesale costs for downstate marketers sourcing from those plants.

3. Agricultural customer density and route economies. Illinois is a top-three US corn state with more than 100,000 farms. Grain drying, livestock buildings, and on-farm domestic use sustain a large year-round agricultural propane base, especially across central and northern Illinois. Dense agricultural routes support more bobtails per supplier, lower per-gallon overhead, and tighter competition along I-55, I-57, I-72, I-74, I-39, and I-70 corridors. Residential customers benefit from infrastructure that exists primarily to serve farms.

4. Natural-gas-dominant Chicago metro keeps residential propane focused. Cook, DuPage, Lake, Will, Kane, and McHenry counties are overwhelmingly served by Peoples Gas, Nicor Gas, and North Shore Gas natural-gas distribution. That concentrates residential propane demand into exurban and rural Illinois where the supply infrastructure is already optimised. The downstate-rural market is large and competitive; the metro propane market is small and supplemental, and that segmentation keeps statewide averages low.

5. The October-November agricultural draw is the one risk window. The single moment Illinois prices spike is a wet corn-and-soybean harvest. When grain comes off wet, on-farm and elevator dryers consume tens of millions of gallons of propane in a 4-6 week window across Illinois, Iowa, Indiana, and Minnesota. A wet harvest can pinch downstate residential supply briefly and add $0.15-$0.40/gal to spot rates. The structural lesson: top up to 75-80% in early September before the draw begins.

Illinois Propane Suppliers: How to Choose

Illinois has hundreds of active residential and agricultural propane marketers. Rather than publish a brand list that ages quickly, here are the four supplier tiers in the Illinois market, what each is best at, and the verified Illinois registries to confirm a marketer before you sign.

National chains operating in Illinois

Major US propane retailers maintain Illinois branch operations across both downstate and the Chicago collar counties. National chains generally offer broad geographic coverage and 24/7 emergency lines, but pricing rarely beats Illinois regional operators that have in-state bulk storage. Useful when you need consistent service across multiple Illinois addresses or already have a national-chain tank in place.

Best for: multi-property owners, customers wanting standardised billing, and households already on a national-chain tank where swap-out cost would erode the savings.

Illinois regional operators with in-state bulk storage

Mid-sized Illinois marketers with their own bulk plants and bobtail fleets, typically headquartered downstate near Mt. Vernon, Springfield, Bloomington, Decatur, or Peoria. These operators source directly from Wood River refinery, Robinson refinery, and Mt. Vernon storage, removing one or two distributor layers from the supply chain. Often the per-gallon price leaders for downstate rural customers. Many run year-round agricultural propane programs alongside residential service.

Best for: downstate residential customers, rural farmsteads, agricultural operations needing crop-drying volume in October-November, and any household south of I-80 looking for the most aggressive per-gallon pricing.

Local independents and county-based operators

Small family-run marketers serving one or two Illinois counties from a single bulk plant. Typically the lowest overhead in their service zone, often the cheapest per-gallon rate, and the most flexible on delivery timing. Limited geographic reach: if you move outside their delivery radius the contract does not travel with you.

Best for: long-term residents in a single county, customers who value direct-dial dispatch over a national call center, and anyone for whom local relationships and route familiarity matter more than 24/7 brand-standard service.

Cooperatives (FS, GROWMARK system)

Agricultural supply cooperatives serve a large share of downstate Illinois propane volume, particularly for grain drying, livestock, and on-farm domestic use. Member-pricing benefits and patronage refunds can lower the effective per-gallon cost below stated rack prices. Some cooperatives also extend residential service to non-farm rural households inside their delivery footprint.

Best for: working farms, rural acreage, and any household already a cooperative member through grain or feed accounts.

Verify before you sign, Illinois registries

Illinois Office of the State Fire Marshal (OSFM) regulates LP-Gas storage, transport, and installation under 41 Ill. Adm. Code Part 200, which adopts NFPA 58. Confirm a supplier's bulk plant has a current OSFM inspection. Reach OSFM Fire Prevention & Building Safety at sfm.illinois.gov LP-Gas page or call (217) 785-0969.
Illinois Propane Gas Association (IPGA), the state trade association at ilpga.org, lists active Illinois marketers, runs CETP safety training for member technicians, and publishes consumer safety material. Membership is voluntary, but most established Illinois propane companies are members.
National Propane Gas Association, the national trade body at npga.org, operates the Certified Employee Training Program (CETP). Ask which of your supplier's drivers and service technicians hold current CETP certifications.

Note: unlike some states, the Illinois OSFM does not issue a per-company "propane dealer license", Part 200 instead requires that personnel be properly trained and that each installation comply with NFPA 58. Verification is by inspection record and CETP credential, not by a license number.

Illinois Propane Fill Costs by Tank Size (at $2.03/gal)

Propane tanks fill to 80% of stated capacity (the "80% rule") to allow for thermal expansion. Below is what each fill costs at the 2026 Illinois EIA average. Real-world quotes vary 10-15% above or below the EIA average depending on supplier tier, contract type, downstate-vs-metro location, and delivery frequency.

Tank size	Usable gallons (80%)	Fill cost at $2.03/gal	vs national ($2.67/gal)
100 gal	80 gal	$162	-$52
250 gal	200 gal	$405	-$130
500 gal	400 gal	$810	-$259
1000 gal	800 gal	$1621	-$518

Compare to the national refill cost guide or check pricing in other states.

Illinois Heating Season, Ag Draw & Annual Use

Illinois's residential heating season runs roughly five months, mid-October through mid-March, with peak demand in January and February. Spring (April-May) and early fall (September-October) shoulder seasons see modest space-heating demand on cold nights, while June-August is essentially water-heating, cooking, and pool/grill demand for propane-heated households.

Typical Illinois propane-heat households consume 700-1,100 gallons per year, depending on house size, insulation, and which appliances are propane. A 2,000 sqft farmhouse in Sangamon, McLean, Champaign, or Macon county with propane handling space heat, water heat, range, dryer, and a backup generator averages 900-1,000 gallons. A propane-only-for-cooking-and-water-heating household, with electric heat or natural gas hookup, runs 100-250 gallons annually.

Translated to dollars at the 2026 Illinois average: a 1,000 gallon household pays $2026 per year for fuel alone, before tank rental fees, delivery surcharges, or service contracts. That is roughly $650 less than a comparable household in a national-average market and several hundred dollars below a Northeast-state household at the most expensive end.

Tornado season triggers generator demand. Illinois tornado season runs March through July, with the highest activity in April-June. After a major outbreak, like the December 2021 Edwardsville-area events or recurring spring storms across central Illinois, propane cylinder exchange and bobtail capacity can briefly tighten as residential generator runtime spikes. Households with whole-home propane standby generators should keep a baseline 50% tank reserve through the spring storm season, not just the heating season.

LIHEAP via DCEO covers propane-heated households. The Low Income Home Energy Assistance Program (LIHEAP) is administered in Illinois by the Department of Commerce and Economic Opportunity (DCEO) Office of Community Assistance under the "Help Illinois Families" brand. Apply October 1 through August 15 each program year at helpillinoisfamilies.com or call 1-833-711-0374. Direct Vendor Payment goes to your propane supplier on your behalf. Priority intake for households age 60+, with a member with a disability, with children under 5, or with less than 25% remaining tank fuel. PIPP (Percentage of Income Payment Plan) is layered for utility-billed customers at or below 200% of the federal poverty level, confirm current enrollment status with your local Community Action Agency before applying.

Summer pre-buy + September top-up is the Illinois playbook. Pre-buying or capping in May-July routinely saves $200-$400 per year for a 1,000 gallon household versus winter spot rates, and topping up to 75-80% in early September protects against a wet-harvest October-November price spike. Most Illinois suppliers run pre-buy enrollment between May 1 and August 15. Read the fine print: cap-price contracts let you keep savings if wholesale falls during harvest; flat pre-buy locks you in either direction.

Illinois vs Other Midwest States (2026)

State	Price/gal	500-gal refill (400 usable)	vs national ($2.67)
Nebraska	$1.64	$657	-39%
Iowa	$1.66	$664	-38%
North Dakota	$1.70	$680	-36%
South Dakota	$1.84	$736	-31%
Kansas	$1.98	$791	-26%
Illinois (this page)	$2.03	$810	-24%
Minnesota	$2.06	$822	-23%
Wisconsin	$2.07	$826	-23%
Missouri	$2.21	$884	-17%
Michigan	$2.37	$948	-11%
Indiana	$2.63	$1054	-1%
Ohio	$2.69	$1078	+1%
Midwest regional average	$2.07	$828	-23%
National average	$2.67	$1070	—

Illinois sits among the cheapest Midwest residential propane markets, alongside Iowa, Kansas, and Nebraska. The full Midwest region averages $2.07/gal, well under the $2.67/gal national mark. The Midwest's structural advantage is PADD 2 storage proximity, in-state refinery LPG output, and a dense agricultural propane base that supports year-round route economies.

Illinois Propane FAQ

Who has the cheapest propane in Illinois?

There is no single cheapest supplier statewide. Illinois pricing varies sharply by region. Downstate counties along I-55, I-57, I-72, and I-74 typically see the lowest residential per-gallon rates because of dense supplier competition, proximity to PADD 2 storage at Mt. Vernon (Williams Companies) and Wood River, and high agricultural-customer route density. Chicago metro propane runs higher because most of Cook, DuPage, Lake, and Will counties are served by natural-gas utilities (Peoples Gas, Nicor, North Shore Gas) and propane volumes are smaller and more dispersed. In any market, request quotes from at least three suppliers before signing: one regional operator with bulk in-state storage, one local independent in your county, and one national chain. Lock-in or summer-fill contracts in May-August routinely beat winter spot pricing by $0.20-$0.50/gal. The 2026 Illinois EIA average is $2.03/gal, against a national mark of $2.67/gal.

Why is propane cheaper in Illinois than the national average?

Illinois sits inside PADD 2, the Midwest district, on top of large-volume propane infrastructure. Phillips 66's Wood River refinery (Roxana, IL) and Marathon's Robinson refinery (Robinson, IL) both produce LPG as a byproduct of crude refining. Williams Companies operates one of the largest underground propane storage caverns in the United States at Mt. Vernon, IL, with direct rail and pipeline access to Conway (KS) and Mont Belvieu (TX). That combination, in-state refinery output, in-state salt-cavern storage, and dense pipeline connectivity, keeps Illinois supply costs well below Northeast and West Coast markets. The 2026 EIA Illinois residential average is $2.03/gal, which is 24% below the $2.67/gal national figure and 2% below the $2.07/gal Midwest regional average.

Am I eligible for LIHEAP through Illinois DCEO?

The Low Income Home Energy Assistance Program (LIHEAP) is administered in Illinois by the Department of Commerce and Economic Opportunity (DCEO) Office of Community Assistance under the "Help Illinois Families" brand. The 2025-2026 program year accepts applications from October 1 through August 15, 2026, or until funds are exhausted. Households are typically income-eligible at or below the published state threshold (commonly indexed to roughly 200% of the federal poverty level for related Illinois energy programs). LIHEAP covers natural gas, propane, electricity, and other deliverable fuels. Apply online at helpillinoisfamilies.com or call 1-833-711-0374 for live support. Priority intake is for households age 60+, households with a member with a disability, families with children under 5, and any household disconnected, scheduled for disconnection within 7 days, or with less than 25% remaining in their propane tank. Bring 30 days of income proof and a recent propane delivery receipt or tank gauge reading.

Is the Percentage of Income Payment Plan (PIPP) supplement still available in Illinois?

PIPP is an Illinois benefit-choice option layered on top of LIHEAP that caps a qualifying household's energy spend at a fixed percentage of household income. Eligibility is at or below 200% of the federal poverty level. The program has historically been targeted to customers of Ameren Illinois, ComEd, Nicor Gas, and Peoples Gas, propane-only households are usually not PIPP-eligible because PIPP enrolls through utility billing systems, not deliverable-fuel vendors. The State of Illinois has periodically suspended new PIPP enrollment due to funding constraints. Confirm current status with your local Community Action Agency before applying. Propane-heated households should apply for the standard LIHEAP Direct Vendor Payment instead, which pays your propane supplier directly.

Does Illinois license propane dealers, and how do I check a supplier?

Illinois regulates LP-Gas storage, transport, and installation under 41 Ill. Adm. Code Part 200, administered by the Office of the State Fire Marshal (OSFM). Part 200 adopts NFPA 58 (Liquefied Petroleum Gas Code) and governs tank installation, container marking, transport, and dispensing. The OSFM does NOT issue a per-company "propane dealer license" the way some states do, instead it requires that personnel performing installation, service, operation, and maintenance be properly trained and that all installations meet NFPA 58 and Part 200 requirements. Before signing a contract, ask your prospective supplier: (1) which technicians are CETP-certified through the Propane Education & Research Council, (2) whether they carry the required liability and cargo insurance for LP-Gas hauling, and (3) whether their bulk plant has a current OSFM inspection. The Illinois Propane Gas Association (IPGA) at ilpga.org maintains a member directory of established Illinois marketers and can confirm whether a company is an active industry member.

When is the cheapest time to fill a propane tank in Illinois?

For residential heating customers, the cheapest window is May through July, when wholesale propane bottoms before the fall agricultural draw. The pricing risk in Illinois is October-November: the corn-drying season pulls millions of gallons of propane into agricultural elevators and on-farm dryers across central and northern Illinois, which can pinch residential supply and push spot prices up $0.15-$0.40/gal during a wet harvest. A November-2019-style wet harvest can spike rural downstate prices for 4-6 weeks. Tactical play: fill to 80% in late June or July at summer-low rates, then top up to 75% in early September before the harvest draw begins. Avoid topping up December-February if you can, that is when winter wholesale spreads peak. At the 2026 IL average of $2.03/gal, a 500-gallon refill (400 usable) costs $810 versus roughly $932 at a winter-peak quote.

How does pricing differ between downstate Illinois and the Chicago metro?

Downstate Illinois, broadly the Springfield, Bloomington, Decatur, Champaign, Peoria, Quincy, and Carbondale catchment areas, has the densest propane customer base in the state and the most active competitive supply. Per-gallon rates downstate often sit $0.05-$0.20/gal below the Chicago collar counties because of route density, proximity to Wood River and Robinson refinery output, and proximity to Mt. Vernon storage. The Chicago metro (Cook, DuPage, Lake, Will, Kane, McHenry, Kendall) is overwhelmingly served by natural gas via Peoples Gas, Nicor, and North Shore Gas, so residential propane is concentrated in exurban townships, generator backup, and outdoor cooking, smaller volumes per route, higher per-gallon overhead. Generator demand also surges in metro Chicago after major thunderstorm and tornado events (typically March-July), which can briefly tighten cylinder-exchange and bobtail capacity. Statewide the 2026 EIA average is $2.03/gal, but expect downstate rural quotes 5-10% under that and metro-Chicago residential quotes 5-10% over.