Diesel Prices in California Today
Average diesel price in California: $8.439 per gallon on September 22, 2026. U.S. average $6.529. Updated daily.
What is the price of diesel in California today?
Diesel in California averages $8.439 per gallon today (September 22, 2026), $1.910 more than the U.S. average of $6.529. California ranks #51 of 51 for cheapest diesel (1 = cheapest). A loaded semi at about 6.3 mpg spends about $1.34 per mile on fuel in California.
per gallon today
U.S. average $6.529
of 51 (1 = cheapest)
semi truck, today
Fuel cost per mile in California
Estimated diesel cost at today's California price of $8.439 a gallon, using fuel economy calibrated to FHWA and NACFE data.
| Truck | Fuel per mile | Fuel per 1,000 miles |
|---|---|---|
| Dry Van38,000 lbs, ~6.3 mpg | $1.34 | $1,342 |
| Reefer38,000 lbs, ~6.0 mpg | $1.40 | $1,398 |
| Flatbed40,000 lbs, ~6.0 mpg | $1.40 | $1,395 |
| Hotshot12,000 lbs, ~8.9 mpg | $0.95 | $948 |
| Box Truck7,000 lbs, ~9.1 mpg | $0.93 | $925 |
Your numbers depend on load weight, speed, terrain and idling. Enter them in the truck fuel cost calculator for an exact estimate.
Frequently asked questions
What is the price of diesel in California today?
Diesel in California averages $8.439 per gallon today (September 22, 2026), $1.910 more than the U.S. average of $6.529. California ranks #51 of 51 for cheapest diesel (1 = cheapest). A loaded semi at about 6.3 mpg spends about $1.34 per mile on fuel in California.
How much does it cost to fill a semi truck in California?
At $8.44 a gallon, 150 gallons of diesel costs about $1,266 and 200 gallons about $1,688 in California today.
Is diesel cheaper in California than nearby states?
California is priced on its own regional market. California is $8.439.
How often are California diesel prices updated?
Every day. This page refreshes each morning from daily state averages, with the EIA weekly survey as a backup.
Running freight through California?
Texas Solutions dispatches semis for 5%, hotshots for 8% and box trucks for 10% of weekly gross. We plan lanes to cut empty miles and fuel.