# The US propane market, explained > The US propane market runs on four moving parts: production, mostly a byproduct of natural gas processing rather than something drilled for on purpose, the Mont Belvieu storage hub that prices the whole country, a storage cycle that builds all summer to cover a winter heating season, and exports, which have made the US the world's dominant propane supplier since 2010 and put a floor under the domestic price. _Updated Aug 13, 2026._ The US propane market is not one market. It is four linked pieces, production, the Mont Belvieu hub, a seasonal storage cycle and exports, and a home heating bill sits at the far end of all four. Understanding it starts with where the barrel comes from, not with the price on a delivery ticket. ## Production: a byproduct, not a target Almost nobody drills for propane on purpose. The US Energy Information Administration puts roughly 80 percent of US propane supply at natural gas processing plants, which strip it out of the raw gas stream alongside ethane and butane, with refineries making the rest as crude oil is broken down into other fuels. That matters for how the market behaves: production runs on a schedule set by drilling and refining activity, which responds to gas and oil prices, not to how cold the coming winter looks. A propane glut or a propane shortage is usually a side effect of a decision made about natural gas or crude, not a decision about propane itself. [Chart: US propane production](https://fill-line.com/supply/production) ([data](https://fill-line.com/supply/production.md) — chart image: https://fill-line.com/charts/supply/production/chart.png) The chart above is the live weekly US production series, in thousand barrels per day, from EIA's Weekly Petroleum Status Report. It runs fairly steady across a year next to how sharply prices and demand swing with the seasons, which is the point: production is the slow-moving input everything else gets built on top of. ## Mont Belvieu: where the market prices itself Nearly every US propane price, wholesale or retail, is ultimately a markup over one number: the daily spot price at Mont Belvieu, a town on the Gulf Coast east of Houston that sits on top of a salt dome. The caverns washed out of that dome hold the largest concentration of natural gas liquids storage in the world, and the fractionators, pipelines and export docks built around them make the place the physical center of the market, not just a pricing convention. Supply contracts around the country are written at a differential to Mont Belvieu, and the inland hub at Conway, Kansas trades as a spread to it rather than on its own terms. [Chart: Mont Belvieu propane spot price](https://fill-line.com/spot/mont-belvieu) ([data](https://fill-line.com/spot/mont-belvieu.md) — chart image: https://fill-line.com/charts/spot/mont-belvieu/chart.png) That spot price, charted live above, is a wholesale hub number: free on board at Mont Belvieu, carrying none of the pipeline tariff, terminal fee, trucking or dealer service that stack up between the hub and a residential tank. The [full breakdown of that stack lives in a companion guide](/guides/how-propane-is-priced); this one stays at the market-structure level. ## The storage cycle: building for a season that only lasts half the year Propane demand is heavily seasonal, propane production is not, and inventory is what bridges the gap. [US propane stocks](/stocks/us), tracked by EIA in the same Weekly Petroleum Status Report as production, build from spring through summer as production outruns the mild-weather draw, then get pulled down through the October-March heating season as furnaces, and in the Midwest, grain dryers, pull on the cushion faster than production alone can refill it. Where that cushion sits relative to its own five-year history heading into October is one of the clearest signals of how a winter is likely to trade, tighter than normal or looser than normal. ## Demand: heating season is the biggest piece, not the only one Residential heating drives the seasonal shape of US propane demand, and it is why this site's state and regional price pages carry an October-March survey window rather than running year round. But it is not the whole demand picture. Propane fires grain dryers across the Corn Belt every fall, ahead of any real cold. Poultry houses across the South run propane brooders on a schedule set by chick placements, not weather. Propane and its co-product propylene are petrochemical feedstocks, cracked into other chemicals independent of any thermostat. EIA's weekly demand proxy, "product supplied," rolls all of that into one number: production plus imports, minus the change in stocks, minus exports. [Chart: US propane inventories](https://fill-line.com/stocks/us) ([data](https://fill-line.com/stocks/us.md) — chart image: https://fill-line.com/charts/stocks/us/chart.png) ## Exports: the floor under the domestic price The US has been a net propane exporter since 2010, and it now ships more of its production overseas, mostly to East Asian and Latin American buyers loading at Gulf Coast terminals, than any other country supplies to the world market. That export flow is not a side channel. Because loaded cargoes bid for the same barrels a US dealer's rack supply comes from, heavy export demand can pull on [Gulf Coast stocks](/stocks/padd3) and firm the Mont Belvieu price in a week that has nothing to do with US weather. The practical result is an export-parity floor: the domestic wholesale price cannot fall too far below what an overseas buyer would pay to have the same barrel loaded onto a ship, because if it did, more of the barrel would simply go onto the ship instead. ## How the pieces fit together Put them in sequence and the market reads as one chain rather than four separate facts. Gas processing and refining set a fairly steady production rate. Some of that supply gets exported at a pace set by overseas demand and shipping capacity; what is left builds [US stocks](/stocks/us) through the summer. [Mont Belvieu](/spot/mont-belvieu) prices all of it, wholesale and export alike, off one daily number. Winter arrives, heating and crop-drying demand draw the stockpile down, and the [national demand read](/supply/demand) shows how fast. The distance between the Mont Belvieu hub price and what a household actually pays, tracked on [US residential price vs Mont Belvieu](/spreads/us-vs-mont-belvieu), is delivery, tank service and dealer margin layered on top of everything above. None of this tells a reader when propane is cheap or expensive relative to where it is headed. The Fill Line reports the public EIA numbers behind each link above and explains how they connect. It does not forecast prices and never advises on timing a purchase, a lock or a pre-buy. The Fill Line is a free weekly read of the public propane numbers. Stocks, the Mont Belvieu spot and the weekly supply balance update year round; the state price survey resumes in October. One email a week on what moved. ## Related data + guides - [Mont Belvieu propane spot price](https://fill-line.com/spot/mont-belvieu) - [US propane inventories](https://fill-line.com/stocks/us) - [US propane demand](https://fill-line.com/supply/demand) - [US propane production](https://fill-line.com/supply/production) - [US propane exports](https://fill-line.com/supply/exports) - [US residential price vs Mont Belvieu](https://fill-line.com/spreads/us-vs-mont-belvieu) - [How propane is priced: from Mont Belvieu to your tank](https://fill-line.com/guides/how-propane-is-priced) - [Glossary](https://fill-line.com/glossary) ## Common questions ### How is the US propane market structured? Four linked pieces: production, mostly a byproduct of natural gas processing rather than something drilled for on purpose; the Mont Belvieu hub on the Gulf Coast, which prices nearly every US wholesale and retail gallon as a markup over its daily spot price; a seasonal storage cycle that builds inventory all summer to cover the October-March heating season; and exports, which have made the US the world's dominant propane supplier since 2010 and put a floor under the domestic price. ### Where does US propane come from? Mostly natural gas processing plants, which strip propane out of raw gas alongside ethane and butane. EIA puts roughly 80 percent of US supply there, with petroleum refineries making the rest as they break crude oil into other fuels. Very little US propane is produced on purpose; it is a byproduct of decisions made about natural gas and crude oil supply. ### Is the US propane market seasonal? Demand is seasonal even though production is not. Residential heating demand runs an October-March season, and grain drying adds a fall spike ahead of it, so inventory built over the spring and summer is what covers the gap. Production itself runs on a comparatively steady year-round schedule set by gas processing and refining activity. ### Why do US propane prices track exports? The US has exported more propane than it imports since 2010 and now ships a large share of production overseas. Because export cargoes bid for the same barrels a domestic dealer's supply comes from, strong overseas demand can tighten Gulf Coast supply and firm the Mont Belvieu hub price independent of US weather, which sets a floor under the domestic wholesale price. --- Canonical URL: https://fill-line.com/guides/us-propane-market