Rocky Mountain Diesel Price Trend
Weekly On-Road Diesel Fuel Prices · PADD 4
States: CO, UT, WY, MT, ID
The Rocky Mountain (PADD 4) on-road diesel price is $5.49 per gallon as of 2026-05-11, down $0.030 (-0.5%) from the previous week. Over the past 12 weeks, prices in this region have ranged from $3.55 to $5.52 per gallon.
📈 Price History (19 Weeks)
📊 Weekly Price Data
| Week | Price ($/gal) | Change | Trend |
|---|---|---|---|
| 2026-05-11 | $5.49 | $-0.030 (-0.5%) | ↘️ |
| 2026-05-04 | $5.52 | +$0.250 (+4.7%) | 📈 |
| 2026-04-27 | $5.27 | +$0.060 (+1.2%) | 📈 |
| 2026-04-20 | $5.21 | $-0.050 (-1.0%) | 📉 |
| 2026-04-13 | $5.26 | +$0.290 (+5.8%) | 📈 |
| 2026-04-06 | $4.97 | $-0.300 (-5.7%) | 📉 |
| 2026-03-30 | $5.27 | +$1.090 (+26.1%) | 📈 |
| 2026-03-23 | $4.18 | +$0.050 (+1.2%) | 📈 |
| 2026-03-16 | $4.13 | +$0.060 (+1.5%) | 📈 |
| 2026-03-09 | $4.07 | +$0.060 (+1.5%) | 📈 |
| 2026-03-02 | $4.01 | +$0.110 (+2.8%) | 📈 |
| 2026-02-23 | $3.90 | +$0.130 (+3.4%) | 📈 |
| 2026-02-16 | $3.77 | +$0.080 (+2.2%) | 📈 |
| 2026-02-09 | $3.69 | +$0.050 (+1.4%) | 📈 |
| 2026-02-02 | $3.64 | +$0.040 (+1.1%) | 📈 |
| 2026-01-26 | $3.60 | +$0.040 (+1.1%) | 📈 |
| 2026-01-19 | $3.56 | $-0.020 (-0.6%) | ↘️ |
| 2026-01-12 | $3.58 | +$0.030 (+0.8%) | 📈 |
| 2026-01-05 | $3.55 | — | ➡️ |
⚖️ Diesel vs Gasoline Comparison
How does diesel compare to regular gasoline for ground transportation? Diesel vehicles typically achieve better fuel efficiency (35 MPG vs 30 MPG), which can offset the higher per-gallon cost on longer trips.
Diesel
Gasoline
Bottom line: On a per-mile basis, diesel costs $0.2¢ more per mile than gasoline in this region. Over a 100-mile trip, that's a difference of $0.19 .
🛣️ Diesel Trip Cost Estimates (Rocky Mountain)
| Distance | 🚗 Diesel Car (35 MPG) | 🚐 Diesel Van (24 MPG) | 🚛 Diesel Truck (18 MPG) |
|---|---|---|---|
| 10 miles | $1.57 | $2.29 | $3.05 |
| 25 miles | $3.92 | $5.72 | $7.63 |
| 50 miles | $7.84 | $11.44 | $15.25 |
| 100 miles | $15.69 | $22.88 | $30.50 |
| 200 miles | $31.37 | $45.75 | $61.00 |
Based on current Rocky Mountain diesel price of $5.49/gal.
About Rocky Mountain Diesel Prices (PADD 4)
The Rocky Mountain region is the smallest PADD district by both volume and population. Its limited refining capacity and distance from major supply corridors often result in diesel prices that sit between the lowest (Gulf Coast) and the highest (West Coast). Seasonal weather events can cause sharp, short-lived price spikes.
Key Facts
- Region: Rocky Mountain (PADD 4)
- States covered: CO, UT, WY, MT, ID
- Current price: $5.49/gallon (as of 2026-05-11)
- 12-week low: $3.55/gal (2026-01-05)
- 12-week high: $5.52/gal (2026-05-04)
- Data source: U.S. Energy Information Administration (EIA)
Why Rocky Mountain Diesel Prices Matter
Diesel fuel powers the trucks, buses, and freight vehicles that keep the Rocky Mountain economy moving. When diesel prices rise, the cost of shipping goods increases, which can lead to higher consumer prices at the store. Fleet operators, truck drivers, and logistics companies in CO and surrounding states track these prices closely to manage fuel budgets and adjust surcharges.