South Dakota Propane Price 2026: Cost Per Gallon, Suppliers & Delivery

South Dakota residential propane runs $1.84/gal in 2026, roughly 31% below the national average and the fourth-cheapest market in the country after Nebraska, Iowa, and North Dakota. This page covers the EIA snapshot, the PADD 2 and ag-load reasons SD prices stay low, fill-by-tank-size math, LIHEAP through the SD Department of Social Services, and the State Fire Marshal's licensing process for any dealer you buy from.

Latest EIA residential propane price

Source: EIA South Dakota 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.

South Dakota Propane Pricing Snapshot (2026)

South Dakota residential avg

$1.84/gal

EIA SHOPP weekly survey, statewide retail average, week ending 30 March 2026

vs national average

-31%

National avg $2.67/gal. SD pays $0.83 less per gallon.

vs Midwest region avg

-11%

Region avg $2.07/gal. SD sits below the regional norm.

Annual fuel cost (1,000 gal)

$1840

Typical SD propane-heat household uses 800-1,200 gal/year. National-avg market would pay $2674.

500-gallon refill (400 usable)

$736

Most common residential tank size in SD

Best time to fill

May to Aug

Off-season pre-buy and cap-price contracts typically save 10-20% on the year's spend

South Dakota is one of the cheapest US markets for residential propane in 2026. The structural drivers are PADD 2 supply proximity, the year-round agricultural propane base (sunflower drying, corn drying, cattle and dairy), and the fact that Sioux Falls and Rapid City run on natural gas (MidAmerican Energy and Black Hills Energy respectively), so residential propane is concentrated in rural counties and reservations where supplier routes are built around the ag load.

Why South Dakota Propane Prices Sit Where They Do

South Dakota consistently sits in the bottom decile of US residential propane prices. The drivers are structural and not seasonal, which means SD households can plan around them rather than hope for a good week.

1. PADD 2 storage proximity. South Dakota sits inside PADD 2, the most propane-rich petroleum administration district in the country. The Conway, Kansas underground storage hub and Bakken/Williston wet-gas processing in neighbouring North Dakota mean SD never pays the long-haul transport premium that pushes Northeast and West Coast prices high. Pipeline and rail distances from production to in-state bulk storage are short, and the per-mile freight cost compounds favourably across the supply chain.

2. Year-round agricultural propane base. Sunflower drying (SD is consistently top-3 nationally), corn drying across the eastern counties, plus cattle and dairy operations from the James River valley out to the Black Hills create a baseline of ag propane demand that residential markets do not have. That ag load funds denser supplier routes, larger bulk-storage volumes per terminal, and stronger competition between retailers, which all flow through to lower per-gallon residential pricing.

3. Natural-gas dominance in metro areas. Sioux Falls runs on MidAmerican Energy natural-gas service; Rapid City runs on Black Hills Energy. Together those metros cover most of the state's population, which leaves residential propane concentrated in rural counties, the Black Hills foothills, and the nine reservations. Suppliers serving those zones build their economics around the ag and seasonal-tourism load, not residential alone, so per-gallon overhead stays manageable even on long rural routes.

4. Dispersed but predictable rural delivery. West River SD (Custer, Pennington, Lawrence, Meade, Fall River, Bennett, Shannon-Oglala Lakota) has lower population density than East River. Supplier routes there are longer, but they are also predictable, every farm and every reservation household is on a known auto-fill schedule built around harvest, calving, and winter heat. Predictability lets retailers price tighter than they could in a randomly-distributed customer base.

South Dakota Propane Fill Costs by Tank Size (at $1.84/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 SD 2026 average against the national-average rate of $2.67/gal. Real-world quotes vary 10-15% above or below the EIA average depending on supplier, contract type, and route density.

Tank size	Usable gallons (80%)	Fill cost at $1.84/gal	vs national ($2.67/gal)
100 gal	80 gal	$147	-$67
250 gal	200 gal	$368	-$167
500 gal	400 gal	$736	-$334
1000 gal	800 gal	$1472	-$667

A typical South Dakota household heating a 2,000 sqft home burns 800-1,200 gallons per year, two or three full fills of a 500-gallon tank. Annual propane spend ranges from $1472 (low usage) to $2208 (high usage) at the current statewide rate. Compare to the national refill cost guide or check pricing in other states.

South Dakota Heating Season & Annual Use

South Dakota's residential heating season runs roughly six months, late October through April, with peak demand in January and February. Rapid City, Pierre, Aberdeen, and the rural James River valley all see multi-week stretches of sub-zero highs and periodic Arctic blasts that push -30F lows. Spring and fall shoulder seasons see modest space-heating demand, while June-August is essentially water-heating, cooking, and pool-heater load only.

Typical SD propane-heat households consume 800-1,200 gallons per year depending on home size, insulation, and how much of the load is propane versus another fuel. A 2,000 sqft home in Pennington County with propane handling space heat, water heat, range, and dryer averages 1,000-1,100 gallons. A propane-only-for-cooking-and-water-heating household, with electric or another fuel for space heat, runs 200-400 gallons annually.

Translated to dollars at the 2026 SD average: a 1,000 gallon household pays $1840 per year for fuel alone, before tank rental fees, delivery surcharges, or service contracts. That is around $834 less than a comparable household in a national-average market.

LIEAP through the SD Department of Social Services. South Dakota's Low Income Energy Assistance Program (LIEAP) is administered by the Department of Social Services, Division of Economic Assistance. Apply at dss.sd.gov/economicassistance/energyassistance, through your county DSS office, or by calling 1-800-233-8503. Eligibility is generally tied to household income (under 60% of state median income) and household size; benefits are paid directly to your propane supplier. The Energy Crisis Intervention Program (ECIP) handles emergencies like a current disconnect or empty tank in deep winter. Funds are first-come, first-served, apply in October at the season's start, not January.

Pre-harvest fill is the single biggest tactical lever. SD's ag propane load tightens residential supply in October and early November during a wet-harvest year because corn and sunflower dryers pull tens of millions of gallons through the same retailer infrastructure. Top up your tank by late September. Tanks below 30% in early October during a wet year can wait two to three weeks for residential delivery while ag demand clears. Pre-buy or cap-price contracts signed in May-August routinely save 10-20% on the year's spend versus paying winter spot.

How LP-Gas Is Regulated in South Dakota

Propane oversight in South Dakota runs through the Office of the State Fire Marshal, a division of the SD Department of Public Safety. Under the South Dakota Fire Code (Chapter 61, Liquefied Petroleum Gases, modeled on NFPA 58) and SD Codified Law, dealers, transporters, resellers, cylinder exchange companies, and appliance installers must obtain a license, carry $500,000 of general liability insurance (including manufacturer's/contractor's and product liability), and notify customers in writing at least once a year about modification obligations on their propane systems.

Compared with states that run a separate LP-Gas Board (Texas, North Carolina), South Dakota's licensing structure is lighter touch but the safety code itself is full NFPA 58. Two practical takeaways:

Verify dealer licensure through the State Fire Marshal's office at dps.sd.gov/emergency-services/state-fire-marshal before signing a service contract. If a company is quoting below-market and is not on the licensee list, walk away.
Industry trade body: the South Dakota Petroleum & Propane Marketers Association (SDP2MA) in Pierre is the state-level association of licensed propane retailers, founded 1918. Member companies on sdp2ma.com are a reasonable starting shortlist.
Resale rule: a licensed dealer must verify any buyer-for-resale is also licensed and certified through the Fire Marshal's board before bulk transfer. This is consumer protection against unlicensed cylinder swaps in rural and reservation markets.

Always get a written quote that itemises per-gallon price, delivery fee, tank rental (if applicable), minimum-delivery surcharge, and any monthly tank fee. Per-gallon spreads of 30-50 cents within the same county are common. Compare two or three quotes before committing.

South Dakota Propane Companies: Verified Supplier List

Always quote at least three suppliers, including one national chain, one regional operator with in-state bulk storage, and one local independent on your route, before signing a service contract or pre-buy. A hand-curated list of named SD propane suppliers (with HQ, coverage area, and notes on contract types) is in our editorial pipeline.

Tier-1 supplier list coming. A hand-curated list of named South Dakota propane suppliers (with HQ, coverage area, and notes on contract types) is in our editorial pipeline. We publish supplier lists only once each name has been verified against the State Fire Marshal's licensee list and the supplier's active service-area page. We do not generate supplier names from training data; that is a hallucination risk we treat seriously.

Verification note. Three reliable starting points for verifying any quote. (1) The South Dakota Office of the State Fire Marshal at dps.sd.gov maintains the licensee list for LP-Gas dealers, transporters, and resellers; if a company is not on it, do not sign. (2) The SD Petroleum & Propane Marketers Association (sdp2ma.com) lists member retailers across the state. (3) The National Propane Gas Association directory at npga.org cross-references licensed retailers nationally. For LIEAP-funded deliveries, your supplier must be willing to accept direct DSS payment, confirm this before applying.

South Dakota vs Neighbouring Midwest States (2026)

State	Price/gal	500-gal refill (400 usable)	vs national ($2.67)
Nebraska	$1.64	$656	-39%
Iowa	$1.66	$664	-38%
North Dakota	$1.70	$680	-36%
South Dakota (this page)	$1.84	$736	-31%
Minnesota	$2.48	$992	-7%
Wisconsin	$2.52	$1008	-6%
Wyoming	$2.58	$1032	-4%
Montana	$2.88	$1152	+8%
National average	$2.67	$1070	0%

South Dakota sits in the cheap-cluster of US propane markets alongside Nebraska, Iowa, and North Dakota, all PADD 2 ag-heavy states with short distances to Conway storage and Bakken wet-gas processing. Minnesota and Wisconsin run a touch higher because their residential customer base skews more suburban-rural mix and their ag dryer load is corn-dominant rather than corn-plus-sunflower. The full Midwest region averages $2.07/gal, all of which sits well below the 2.67 national mark.

South Dakota Propane FAQ

How much does propane cost per gallon in South Dakota?

South Dakota residential propane runs $1.84/gal in the latest EIA SHOPP weekly survey (week ending 30 March 2026, the close of the 2025/26 heating season). That is -31% versus the $2.67 national average and -11% versus the Midwest regional average of $2.07/gal. South Dakota currently sits as the fourth-cheapest state in the country, behind only Nebraska, Iowa, and North Dakota. The number is the statewide retail average; what you actually pay depends on county, contract type (will-call, auto-fill, pre-buy, cap-price), tank ownership, and how rural your route is. West River (Black Hills, Pine Ridge, Rosebud) and far East River (Sioux Falls metro) can swing $0.25-$0.50/gal apart even on the same EIA week.

Why is South Dakota propane so cheap relative to the national average?

Three structural reasons. First, South Dakota sits inside PADD 2 (Midwest), which is the most propane-rich PADD in the country thanks to the Conway, Kansas storage hub and Bakken/Williston wet-gas processing in neighbouring North Dakota. Short pipeline-to-rail distances mean SD rarely pays the transport premium Northeast and West Coast states absorb. Second, agricultural propane is a year-round demand baseline, sunflower drying (SD ranks top-3 nationally), corn drying across the eastern counties, plus cattle and dairy operations from the James River valley west to the Black Hills. That ag base supports denser supplier routes and bigger bulk-storage volumes than a residential-only market would. Third, Sioux Falls and Rapid City are heavily natural-gas-served (Black Hills Energy in Rapid City, MidAmerican Energy in Sioux Falls), which leaves residential propane concentrated in rural and reservation markets where supplier competition still works because routes are designed around the ag load rather than chasing scattered houses.

Does LIHEAP help pay for propane in South Dakota?

Yes. South Dakota's Low Income Energy Assistance Program (LIEAP) is administered by the Department of Social Services (DSS), Division of Economic Assistance. Apply through the DSS portal at dss.sd.gov/economicassistance/energyassistance, by visiting your county DSS office, or by calling 1-800-233-8503 to request a paper application. Eligibility is based on household income (generally under 60% of state median income), household size, type and cost of heating, and where you live. Benefits are paid directly to your propane supplier toward winter fuel costs. The Energy Crisis Intervention Program (ECIP) handles emergencies such as a current disconnect notice or empty tank in deep winter. Funds distribute first-come, first-served, so apply in October at the start of the heating season rather than waiting for January when the queue is longest. Western South Dakota Community Action (WSDCA) and other Community Action agencies also run intake clinics across the state.

Who regulates propane dealers in South Dakota?

LP-Gas oversight in South Dakota runs through the Office of the State Fire Marshal, a division of the South Dakota Department of Public Safety (dps.sd.gov/emergency-services/state-fire-marshal). Under SD Codified Law Title 34 and the South Dakota Fire Code (Chapter 61, Liquefied Petroleum Gases, modeled on NFPA 58), dealers, transporters, resellers, cylinder exchange companies, and appliance installers must obtain a license from the Fire Marshal's board, carry $500,000 of general liability insurance (including manufacturer's/contractor's and product liability), and notify customers in writing at least once per year about modification obligations on their propane systems. Before reselling propane in bulk, a dealer must also confirm the buyer is licensed and certified through the Fire Marshal. Compared with states that run a separate LP-Gas Board (e.g. Texas, North Carolina), South Dakota's licensing structure is lighter touch but the safety code itself is full NFPA 58. If a company is quoting you below-market and is not on the Fire Marshal's licensee list, walk away.

What does propane cost for Black Hills tourism and concession operators?

Commercial propane for Black Hills businesses (Mount Rushmore concessions, Custer State Park lodges, Badlands campgrounds, Deadwood and Hill City restaurants, Sturgis Rally vendors) typically prices a few cents per gallon under residential because the volumes justify direct-from-bulk-storage delivery rather than bobtail residential routes. Off-season (November-April), residential rates are the better reference. In summer peak, expect the Sturgis Rally week (early August) to spike commercial cylinder-exchange rates 15-25% as vendors dump propane into food trucks, RVs, and rental smokers. Operators who pre-buy in May at off-season pricing for August fills routinely save $0.30-$0.60/gal versus paying the rally-week rate. Any seasonal business in the Black Hills should run a written annual contract; one-off summer fills at peak demand are the single most expensive way to buy propane in the state.

How does sunflower and corn drying affect propane demand in South Dakota?

South Dakota is consistently a top-3 sunflower-producing state and a top-10 corn producer, and both crops typically need supplemental drying after harvest if field moisture runs high. Propane fires the dryers. October and early November can pull tens of millions of gallons through SD's ag retailers in a wet harvest year, which tightens residential supply on the same trucks. Two practical implications for households. First, fill before harvest pressure hits, late September at the latest. Tanks below 30% in early October during a wet year can wait two to three weeks for residential delivery while ag demand clears. Second, the East River counties (Brookings, Hutchinson, Hanson, Beadle, Spink) feel the squeeze hardest because that is where the corn-dryer load concentrates; West River households generally see less harvest-season pricing pressure but more weather-related delivery risk in the Black Hills.

How do propane deliveries work on the Native American reservations?

Propane is often the only viable heating fuel on Pine Ridge, Rosebud, Cheyenne River, Standing Rock, Yankton, Crow Creek, Lower Brule, Flandreau, and Sisseton-Wahpeton reservations. Natural gas is essentially absent, electric heat is impractical at -20F, and wood is supplemental at best. LIEAP through DSS applies to tribal members, and tribal energy assistance programs run alongside state LIEAP through Community Action partners and tribal social services offices. Some reservation households have historically bought from cylinder-exchange networks at materially higher per-gallon equivalents than bulk delivery; the state-licensed bulk dealers serving Pine Ridge and Rosebud through Rapid City and the Rosebud-area routes generally price within $0.10-$0.20/gal of the EIA SD average. If you live on or near a reservation and are paying more than $0.50/gal above the statewide average for cylinder swaps, ask whether bulk delivery to a 100-gallon or 250-gallon tank is feasible, and whether DSS LIEAP plus tribal weatherization can fund the install.

How should I prep my propane for a South Dakota winter?

Rapid City, Pierre, Aberdeen, Sioux Falls, and the rural James River valley all see multi-week stretches of sub-zero highs in January and February, plus the periodic Arctic blast that pushes -30F lows. Three rules. First, never let your tank drop below 30% between November and March, that is the threshold where supplier auto-delivery routes can still reach you ahead of crisis. Second, keep your tank pad clear of snow and your regulator vent unobstructed, frosted-over regulators in -25F weather are the most common no-heat call in the state. Third, schedule a system pressure check and leak test in September; a small leak in November becomes a bigger problem in February when the wind is 35 mph. If you are on will-call rather than auto-fill, set a calendar reminder at 40% rather than 25%, supplier route times stretch from 2-3 days off-peak to 7-10 days during a January cold snap.