PADD 4 diesel price (Rocky Mountain) in September 2026
2 official EIA weekly readings available so far
- The average PADD 4 (Rocky Mountain) on-highway diesel price in September 2026 was $5.935 per gallon, calculated from 2 EIA weekly readings available so far.
- The weekly low was $5.805; the weekly high was $6.066.
- That monthly average was $0.520 higher than August 2026.
- It was $2.193 higher than September 2025.
This is a calendar-month view of the official EIA weekly Rocky Mountain series. It averages only the source weeks listed below, not a separate government monthly estimate.
September 2026 weekly chart
Every EIA week in September 2026
| Week of | $/gal | Change |
|---|---|---|
| $5.805 | ▲+$0.250 | |
| $6.066 | ▲+$0.261 |
← August 2026 · all of 2026 · all Rocky Mountain history · monthly CSV
Download the underlying weekly EIA series or see the methodology and source cross-check.