CanningDates › Altitude › New Hampshire
Canning altitude adjustments in New Hampshire
New Hampshire's featured towns sit about 220 to 1,130 ft — a spread that crosses 2 water-bath bands, so which town your kitchen is in genuinely changes the answer.
The lay of the land
New Hampshire's big towns keep to the Merrimack Valley — Manchester at about 220 ft, Concord about 330 — but drive north past the notches and the story flips: Berlin, at about 1,130 ft, already cans with five added water-bath minutes. The White Mountains hold plenty of kitchens above the 1,000-ft line. In this state, which side of the notch you live on is most of the question.
From Manchester at about 220 ft to Berlin at about 1,130 ft, New Hampshire crosses 2 water-bath rows — times as written at the bottom of the state, 5 added minutes at the top. Each band carries one published answer, so find your town's row before the jars go in.
| Town | Elevation | Water bath | Dial gauge | Weighted gauge |
|---|---|---|---|---|
| Manchester | about 220 ft | as written | 11 lb | 10 lb |
| Concord | about 330 ft | as written | 11 lb | 10 lb |
| Berlin | about 1,130 ft | +5 min | 11 lb | 15 lb |
Town not in the table? The altitude lookup takes any New Hampshire ZIP or town and hands back the full card — elevation, minutes, and pressures in one look. Recipe already in hand? The processing time adjuster does the arithmetic on your minutes.
Frequently asked questions
Why do different New Hampshire towns get different canning numbers?
Because New Hampshire's featured kitchens climb from about 220 ft in Manchester to about 1,130 ft in Berlin — a spread that crosses 2 water-bath bands. Each band carries its own published answer, so the right move is reading your own town's row, not your neighbor's.
What would the same recipe look like in Manchester versus Berlin?
In Manchester, a water-bath recipe runs exactly as printed, with a dial gauge at 11 lb. In Berlin, the same recipe takes 5 extra minutes, and the dial climbs to 11 lb. Same recipe, different ground.
Is there one setting that covers all of New Hampshire?
Not quite — even the weighted gauge steps once, from 10 lb in the lowest towns to 15 lb everywhere higher, and water-bath minutes and dial settings vary more. Match the row for where the canner actually sits.