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

Planting zone for 03037 — Deerfield, NH

ZIP code 03037 (Deerfield, Rockingham County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is May 7 and the first fall frost October 4.

Where ZIP 03037 is

Outlined: the ZIP code area · 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
Coldest night−23.3 to −20.6 °C
Last frostMay 7
First frostOct 4
2012 zone5b

Was 5b on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Deerfield, 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 Deerfield, NH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 7median — 50% chance of a later frost
Safe for tender plantsMay 21only 10% chance of frost after
First fall frostOctober 4median — 10% chance by Sep 22
Growing season148 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 24 and returns around October 15.

From the NOAA station Epping, NH — 11 miles away, elevation 161 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 03037

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 26 – Apr 9
SpinachSow outdoors · Mar 26 – Apr 16
Broccoli, cabbageStart indoors · Feb 26 – Mar 12
Broccoli, cabbageTransplant · Apr 16 – Apr 30
Onion setsPlant outdoors · Apr 9 – Apr 23
PotatoesPlant outdoors · Apr 16 – Apr 30
LettuceSow outdoors · Apr 9 – Apr 23
Carrots, beetsSow outdoors · Apr 16 – Apr 30
TomatoesStart indoors · Mar 12 – Mar 26
TomatoesTransplant · May 14 – May 28
Peppers, eggplantStart indoors · Feb 26 – Mar 12
Peppers, eggplantTransplant · May 21 – Jun 4
BeansSow outdoors · May 14 – May 28
Sweet cornSow outdoors · May 14 – May 28
Cucumbers, squashSow outdoors · May 14 – May 28
Fall lettuce, spinachSow outdoors · Aug 9 – Aug 23
GarlicPlant cloves · Sep 20 – Oct 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 7) and first fall frost (Oct 4) 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 03037 came on Apr 12 — 3 days earlier than the 1991–2020 average (Apr 15).

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).

Soil in Deerfield, NH

The soil mapped at the center of ZIP 03037 is Chatfield — slightly decomposed plant material, well drained.

TextureSlightly decomposed plant materialtop layer
DrainageWell drainednatural drainage class
Organic matter95%high
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Chatfield-Hollis-Canton complex, 0 to 8 percent slopes, rocky.

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 03037; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Deerfield, 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 23 mindaylight on June 21
Shortest day8 h 59 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation46.9 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 33 °F, low 14 °F 33°14° JanFebruary: average high 36 °F, low 16 °F 36°16° FebMarch: average high 44 °F, low 24 °F 44°24° MarApril: average high 57 °F, low 34 °F 57°34° AprMay: average high 68 °F, low 44 °F 68°44° MayJune: average high 76 °F, low 54 °F 76°54° JunJuly: average high 82 °F, low 59 °F 82°59° JulAugust: average high 81 °F, low 57 °F 81°57° AugSeptember: average high 73 °F, low 50 °F 73°50° SepOctober: average high 61 °F, low 38 °F 61°38° OctNovember: average high 49 °F, low 30 °F 49°30° NovDecember: average high 38 °F, low 21 °F 38°21° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.09 in precipitation 3.1 JanFebruary: 3.12 in precipitation 3.1 FebMarch: 4.04 in precipitation 4.0 MarApril: 4.01 in precipitation 4.0 AprMay: 3.80 in precipitation 3.8 MayJune: 4.00 in precipitation 4.0 JunJuly: 4.42 in precipitation 4.4 JulAugust: 3.61 in precipitation 3.6 AugSeptember: 3.95 in precipitation 4.0 SepOctober: 4.91 in precipitation 4.9 OctNovember: 3.82 in precipitation 3.8 NovDecember: 4.14 in precipitation 4.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Epping, NH (11 mi away); precipitation: Deerfield 3.2 Wsw, NH (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

032616a
Northwood, NH · 5 mi
030406a
East Candia, NH · 6 mi
032906a
Nottingham, NH · 6 mi
032916a
West Nottingham, NH · 6 mi
032345b
Epsom, NH · 7 mi
030346a
Candia, NH · 7 mi
030776a
Raymond, NH · 8 mi
032756a
Suncook, NH · 9 mi

New Hampshire planting zones →

Questions about 03037

What planting zone is ZIP code 03037?

ZIP code 03037 (Deerfield, NH) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Deerfield, NH?

The median last spring frost (32 °F) near 03037 is May 7; after May 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Epping station.

When is the first frost in Deerfield, NH?

The median first fall frost near 03037 is October 4, giving a median frost-free growing season of 148 days.

When should I plant tomatoes in 03037?

Start tomato seeds indoors around Mar 12 – Mar 26 and set transplants outside around May 14 – May 28, one to three weeks after the median last frost.

How much rain and snow does 03037 get?

About 46.9 inches of precipitation a year (NOAA 1991–2020 normals, Deerfield 3.2 Wsw station).

How hot do summers get in Deerfield, NH?

The average high peaks at 82 °F in July, with about 11 days a year at 90 °F or more.

What kind of soil does 03037 have?

The USDA soil survey maps Chatfield at the center of ZIP 03037: slightly decomposed plant material, well drained.

Did spring come early in Deerfield, NH in 2026?

Spring leaf-out near 03037 came on Apr 12 in 2026, 3 days earlier than the 1991–2020 average (Apr 15), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Deerfield, NH?

Long-day onions: the longest day near 03037 is 15 h 23 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 03037 change?

Yes. The 2012 USDA map put 03037 in zone 5b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.