Illinois Natural Gas Prices
Residential price per thousand cubic feet, month by month, with the national average alongside. June 2026 EIA data. Electricity rates: Illinois electricity page.
Natural gas delivered to homes in Illinois costs $19.71/Mcf (≈ $1.90 per therm) — below the US average of $24.09, the 37th highest of 51 tracked states.
Estimate your bill — therms × Illinois gas price
Your usage × the latest average rate. Fixed charges, demand charges, and utility-specific rates vary — this is the benchmark, not an invoice.
Where Illinois gas prices are heading
Residential $/Mcf, last 12 months and the 5-year view — the winter peaks are heating season.
Illinois natural gas price (12 months) US average
Price, month by month
Last 24 months, residential $/Mcf.
| Month | Price | ≈ per therm |
|---|---|---|
| June 2026 | $19.71/Mcf | $1.90 |
| May 2026 | $15.39/Mcf | $1.48 |
| April 2026 | $14.29/Mcf | $1.38 |
| March 2026 | $12.10/Mcf | $1.17 |
| February 2026 | $11.40/Mcf | $1.10 |
| January 2026 | $9.65/Mcf | $0.93 |
| December 2025 | $9.48/Mcf | $0.91 |
| November 2025 | $10.56/Mcf | $1.02 |
| October 2025 | $15.45/Mcf | $1.49 |
| September 2025 | $21.51/Mcf | $2.07 |
| August 2025 | $23.18/Mcf | $2.24 |
| July 2025 | $22.77/Mcf | $2.20 |
| June 2025 | $20.67/Mcf | $1.99 |
| May 2025 | $16.28/Mcf | $1.57 |
| April 2025 | $13.55/Mcf | $1.31 |
| March 2025 | $10.91/Mcf | $1.05 |
| February 2025 | $9.22/Mcf | $0.89 |
| January 2025 | $8.18/Mcf | $0.79 |
| December 2024 | $8.46/Mcf | $0.82 |
| November 2024 | $10.68/Mcf | $1.03 |
| October 2024 | $15.81/Mcf | $1.52 |
| September 2024 | $20.60/Mcf | $1.99 |
| August 2024 | $20.65/Mcf | $1.99 |
| July 2024 | $20.73/Mcf | $2.00 |
Per-therm figures use a labeled approximation (1 Mcf ≈ 10.37 therms at typical residential heat content) — your bill states your utility's exact conversion and delivery charges.
Gas prices next door
Neighboring states, latest residential $/Mcf.
| State | Price | vs Illinois |
|---|
Common questions
Answered from the data on this page.
What is the price of residential natural gas in Illinois?
Natural gas delivered to residences in Illinois averaged $19.71 per thousand cubic feet ($/Mcf) as of June 2026, per EIA — roughly $1.90 per therm at typical heat content (1 Mcf ≈ 10.37 therms; your utility’s conversion is on the bill).
How does Illinois compare to the national average for natural gas?
The US average is $24.09/Mcf in the same month — Illinois is lower than that, at $19.71/Mcf.
Why is my natural gas bill higher in winter?
Heating demand drives both usage and price. Over the last two winters, Illinois residential gas averaged $9.40/Mcf in December–February; the latest month is above that seasonal average. More therms × higher price is why winter bills dwarf summer ones.
Data: EIA Natural Gas Navigator (monthly residential prices), through June 2026. Electricity comparison: Illinois electricity rates. See the methodology.