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

Planting zone for Nashua, NH

Nashua, NH is in USDA zone 6a across its 5 ZIP codes. The median last spring frost is April 30 and the first fall frost October 12.

Nashua on the zone map

Outlined: its 4 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 codes5
Last frostApr 30
First frostOct 12
Growing season165 days

6a 5 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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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 Nashua, NH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 30median — 50% chance of a later frost
Safe for tender plantsMay 11only 10% chance of frost after
First fall frostOctober 12median — 10% chance by Sep 30
Growing season165 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 17 and returns around October 24.

From the NOAA station Nashua 2 Nnw, NH, elevation 135 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 Nashua

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 19 – Apr 2
SpinachSow outdoors · Mar 19 – Apr 9
Broccoli, cabbageStart indoors · Feb 19 – Mar 5
Broccoli, cabbageTransplant · Apr 9 – Apr 23
Onion setsPlant outdoors · Apr 2 – Apr 16
PotatoesPlant outdoors · Apr 9 – Apr 23
LettuceSow outdoors · Apr 2 – Apr 16
Carrots, beetsSow outdoors · Apr 9 – Apr 23
TomatoesStart indoors · Mar 5 – Mar 19
TomatoesTransplant · May 7 – May 21
Peppers, eggplantStart indoors · Feb 19 – Mar 5
Peppers, eggplantTransplant · May 14 – May 28
BeansSow outdoors · May 7 – May 21
Sweet cornSow outdoors · May 7 – May 21
Cucumbers, squashSow outdoors · May 7 – May 21
Fall lettuce, spinachSow outdoors · Aug 17 – Aug 31
GarlicPlant cloves · Sep 28 – Nov 2
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 30) and first fall frost (Oct 12) 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 03061 came on Apr 9 — 3 days earlier than the 1991–2020 average (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.

Trees 53

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 99

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falpine bearberry0.5 ft · blooms early spring · medium shade tolerance · to −62 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °F

Wildflowers & perennials 171

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °F

Grasses 142

alpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 7

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °F

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 Nashua, NH.

Soil in Nashua, NH

The soil mapped at the center of ZIP 03061 is Windsor — loamy sand, excessively drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureLoamy sanddrains and warms fast; dries out and needs more feeding
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainageExcessively drainednatural drainage class
Organic matter3%moderate
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Urban land.

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 03061; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Nashua, NH

Summer high84 °Faverage high, July
Winter low14 °Faverage low, January
Hot days15days a year at 90 °F or more
Freezing nights155nights a year at 32 °F or less
Growing degree days2,723base 50 °F — the season’s usable heat
Longest day15 h 20 mindaylight on June 21
Shortest day9 h 02 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation48.2 inper year, rain and melted snow
Snowfall53 inper year

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 34 °F, low 14 °F 34°14° JanFebruary: average high 37 °F, low 15 °F 37°15° FebMarch: average high 45 °F, low 23 °F 45°23° MarApril: average high 59 °F, low 34 °F 59°34° AprMay: average high 70 °F, low 46 °F 70°46° MayJune: average high 78 °F, low 56 °F 78°56° JunJuly: average high 84 °F, low 61 °F 84°61° JulAugust: average high 83 °F, low 59 °F 83°59° AugSeptember: average high 75 °F, low 51 °F 75°51° SepOctober: average high 63 °F, low 39 °F 63°39° OctNovember: average high 51 °F, low 30 °F 51°30° NovDecember: average high 40 °F, low 21 °F 40°21° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.44 in precipitation, 14.7 in snowfall 3.4❄15 JanFebruary: 3.22 in precipitation, 14.5 in snowfall 3.2❄15 FebMarch: 4.31 in precipitation, 10.1 in snowfall 4.3❄10 MarApril: 4.21 in precipitation, 0.7 in snowfall 4.2❄1 AprMay: 3.90 in precipitation 3.9 MayJune: 4.32 in precipitation 4.3 JunJuly: 3.65 in precipitation 3.6 JulAugust: 3.91 in precipitation 3.9 AugSeptember: 4.05 in precipitation 4.0 SepOctober: 4.84 in precipitation 4.8 OctNovember: 3.88 in precipitation, 1.7 in snowfall 3.9❄2 NovDecember: 4.46 in precipitation, 11.2 in snowfall 4.5❄11 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Nashua 2 Nnw, NH (2 mi away); precipitation: Nashua 2 Nnw, NH (2 mi away). Daylight is calculated from latitude.

ZIP codes in Nashua

030606a
−10 to −5 °F
030616a
−10 to −5 °F
030626a
−10 to −5 °F
030636a
−10 to −5 °F
030646a
−10 to −5 °F

New Hampshire planting zones →

Questions about Nashua

What planting zone is Nashua, NH?

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

When is the last frost in Nashua, NH?

The median last spring frost is April 30 and the median first fall frost is October 12 (NOAA 1991–2020 normals, Nashua 2 Nnw station).

When can I plant a garden in Nashua, NH?

Cool-season crops like peas and spinach go in around Mar 19 – Apr 9; tomatoes, peppers, beans and squash after about May 7, once frost risk has passed.

What kind of onions grow in Nashua, NH?

Long-day onions: the longest day is 15 h 20 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Nashua, NH get?

About 48.2 inches of precipitation a year and 53 inches of snowfall (NOAA 1991–2020 normals).