New Hampshire diesel prices today
New Hampshire diesel prices todayDiesel averages $6.39 a gallon in New Hampshire on 2 October 2026 — the 22nd most expensive of 51 states, and down $0.03 on the week.
New Hampshire against the other states
$0.02 a gallon above the unweighted mean of AAA's 51 state averages ($6.36). The cheapest diesel is in Texas at $5.79, the dearest in California at $8.38.
Regular gas in New Hampshire is $4.34, so diesel costs $2.05 more per gallon — and more than premium at $5.38.
Tax on a gallon of diesel
$0.24 federal + $0.24 New Hampshire · 42nd highest of 51. The rest — about $5.90 — is the fuel itself, refining, distribution and the retailer’s margin.
Rates as of 1 January 2026. Local taxes, where they apply, are not included.
Diesel prices by city in New Hampshire
AAA's diesel averages for 2 New Hampshire metro areas, cheapest first — $0.02 a gallon between the two ends.
| Metro area | Diesel | vs state |
|---|---|---|
| Portsmouth & Rochester | $6.39 | +$0.00 |
| Manchester | $6.41 | +$0.03 |
Show the data as a table
What a diesel fill-up costs in New Hampshire
- Diesel car or SUV — 18 gal$114.93
- Heavy-duty pickup — 34 gal$217.09
- Box truck — 60 gal$383.10
- Semi truck, two tanks — 250 gal$1,596.25
Diesel in neighbouring states
More for New Hampshire
Frequently asked questions
How much is diesel in New Hampshire today?
$6.39 a gallon, AAA's New Hampshire average for 2 October 2026 — the 22nd most expensive of 51 states. Regular gasoline is $4.34, so diesel costs $2.05 more per gallon.
Are diesel prices going up in New Hampshire?
Diesel is down $0.03 (0.5%) on a week ago, and up $2.59 on a year ago, when it was $3.80, on AAA's own earlier averages.
Where is diesel cheapest in New Hampshire?
Of the 2 metro areas AAA reports in New Hampshire, Portsmouth & Rochester has the cheapest diesel at $6.39 a gallon and Manchester the dearest at $6.41. Individual stations vary around these averages.
How much is the diesel tax in New Hampshire?
$0.48 a gallon: $0.24 federal plus $0.24 in New Hampshire state taxes and fees, the 42nd highest of 51. The state average is $0.36. Rates as of 1 January 2026.
Is diesel cheaper in a neighbouring state?
Yes — Massachusetts ($6.36, $0.02 less). On a 100-gallon fill that is up to $2.40; whether it is worth the drive depends on how far the border is.