As the global oil supply continues to face challenges in the Middle East, the average price of diesel remains above $5 nationwide and in every region of the U.S., with the West Coast average this week at $6.59.

This week, the national price average increased by less than 3 cents, and two of the five regions reported small price drops.

The national average price of a gallon of on-highway diesel was $5.40 on March 30, according to the U.S. Energy Information Administration (EIA). 

However, the weekly report also provides a year-over-year pricing comparison, showing the national average is now $1.81 higher than in 2025 and $1.40 higher than the same time in 2024.

This week, regional average prices increased in three regions. The regional price average increases ranged from 5.5 cents in the East Coast to more than 28 cents in the West Coast region. Two regions, the Midwest and the Gulf Coast, saw lower prices at the start of this week.

The most expensive place to buy diesel is California, at $7.45 per gallon, and the least costly is Oklahoma, at $4.49 per gallon.

Regional Diesel Prices: End of March

Average diesel prices reported by region, as of March 30, were: 

• East Coast: $5.53

• Midwest: $5.10

• Gulf Coast: $5.10

• Rocky Mountain: $5.27

• West Coast: $6.59

Regional Diesel Prices: 4th Week of March

Average diesel prices reported by region, as of March 23, were: 

• East Coast: $5.48

• Midwest: $5.16

• Gulf Coast: $5.13

• Rocky Mountain: $5.17

• West Coast: $6.31

Regional Diesel Prices: 3rd Week of March

Average diesel prices reported by region, as of March 16, were: 

• East Coast: $5.10

• Midwest: $4.97

• Gulf Coast: $4.83

• Rocky Mountain: $4.79

• West Coast: $5.85

Regional Diesel Prices: 2nd Week of March

Average diesel prices reported by region, as of March 9, were: 

• East Coast: $4.90

• Midwest: $4.80

• Gulf Coast: $4.62

• Rocky Mountain: $4.39

• West Coast: $5.55

Regional Diesel Prices: 1st Week of March

Average diesel prices reported by region, as of March 2, were: 

• East Coast: $3.92

• Midwest: $3.89

• Gulf Coast: $3.60

• Rocky Mountain: $3.73

• West Coast: $4.53

Regional Diesel Prices: Final Week of February

Average diesel prices reported by region, as of Feb. 23, were: 

• East Coast: $3.84

• Midwest: $3.80

• Gulf Coast: $3.49

• Rocky Mountain: $3.68

• West Coast: $4.46

Regional Diesel Prices: 3rd Week of February

Average diesel prices reported by region, as of Feb. 16, were: 

• East Coast: $3.76

• Midwest: $3.66

• Gulf Coast: $3.37

• Rocky Mountain: $3.54

• West Coast: $4.37