Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 30, 2026

Planting zone for Hampton, NH

Hampton, NH is in USDA zone 6a across its 2 ZIP codes. The median last spring frost is May 4 and the first fall frost October 8.

Hampton on the zone map

Outlined: its 1 ZIP code areas · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone6a−10 to −5 °F

ZIP codes2

Last frostMay 4

First frostOct 8

Growing season157 days

6a 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Hampton, NH…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Hampton, NH

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 4median — 50% chance of a later frost

Safe for tender plantsMay 18only 10% chance of frost after

First fall frostOctober 8median — 10% chance by Sep 27

Growing season157 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 23 and returns around October 21.

From the NOAA station Greenland, NH, elevation 95 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in Hampton

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 23 – Apr 6

SpinachSow outdoors · Mar 23 – Apr 13

Broccoli, cabbageStart indoors · Feb 23 – Mar 9

Broccoli, cabbageTransplant · Apr 13 – Apr 27

Onion setsPlant outdoors · Apr 6 – Apr 20

PotatoesPlant outdoors · Apr 13 – Apr 27

LettuceSow outdoors · Apr 6 – Apr 20

Carrots, beetsSow outdoors · Apr 13 – Apr 27

TomatoesStart indoors · Mar 9 – Mar 23

TomatoesTransplant · May 11 – May 25

Peppers, eggplantStart indoors · Feb 23 – Mar 9

Peppers, eggplantTransplant · May 18 – Jun 1

BeansSow outdoors · May 11 – May 25

Sweet cornSow outdoors · May 11 – May 25

Cucumbers, squashSow outdoors · May 11 – May 25

Fall lettuce, spinachSow outdoors · Aug 13 – Aug 27

GarlicPlant cloves · Sep 24 – Oct 29

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 4) and first fall frost (Oct 8) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 03843 came on Apr 12 — about the same time as the 1991–2020 average (Apr 13).

average
Apr 132026
Apr 12

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 6a in New Hampshire

486 plants native to the lower 48 states, recorded in New Hampshire, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. Each links to its USDA PLANTS profile.

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Hampton, NH.

Soil in Hampton, NH

The center of ZIP 03843 is mapped as Pits, sand and gravel: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 03843; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hampton, NH

Summer high82 °Faverage high, July

Winter low14 °Faverage low, January

Hot days11days a year at 90 °F or more

Freezing nights154nights a year at 32 °F or less

Growing degree days2,417base 50 °F — the season’s usable heat

Longest day15 h 21 mindaylight on June 21

Shortest day9 h 00 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation46.3 inper year, rain and melted snow

Snowfall57 inper year; 75 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Epping, NH (4 mi away); precipitation: Epping, NH (4 mi away). Daylight is calculated from latitude.

ZIP codes in Hampton

New Hampshire planting zones →

Questions about Hampton

What planting zone is Hampton, NH?

Hampton, NH is in USDA hardiness zone 6a on the 2023 map (6a: −10 to −5 °F).

When is the last frost in Hampton, NH?

The median last spring frost is May 4 and the median first fall frost is October 8 (NOAA 1991–2020 normals, Greenland station).

When can I plant a garden in Hampton, NH?

Cool-season crops like peas and spinach go in around Mar 23 – Apr 13; tomatoes, peppers, beans and squash after about May 11, once frost risk has passed.

What kind of onions grow in Hampton, NH?

Long-day onions: the longest day is 15 h 21 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Hampton, NH get?

About 46.3 inches of precipitation a year and 57 inches of snowfall (NOAA 1991–2020 normals).