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

Planting zone for 03749 — Enfield Center, NH

ZIP code 03749 (Enfield Center, Grafton County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 21 and the first fall frost September 26.

Where ZIP 03749 is

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.

Zone5a−20 to −15 °F
Coldest night−28.9 to −26.1 °C
Last frostMay 21
First frostSep 26
2012 zone5a

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 5a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Enfield Center, 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 Enfield Center, NH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 21median — 50% chance of a later frost
Safe for tender plantsJune 5only 10% chance of frost after
First fall frostSeptember 26median — 10% chance by Sep 12
Growing season127 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 8 and returns around October 5.

From the NOAA station Grafton, NH — 7 miles away, elevation 830 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 03749

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 9 – Apr 23
SpinachSow outdoors · Apr 9 – Apr 30
Broccoli, cabbageStart indoors · Mar 12 – Mar 26
Broccoli, cabbageTransplant · Apr 30 – May 14
Onion setsPlant outdoors · Apr 23 – May 7
PotatoesPlant outdoors · Apr 30 – May 14
LettuceSow outdoors · Apr 23 – May 7
Carrots, beetsSow outdoors · Apr 30 – May 14
TomatoesStart indoors · Mar 26 – Apr 9
TomatoesTransplant · May 28 – Jun 11
Peppers, eggplantStart indoors · Mar 12 – Mar 26
Peppers, eggplantTransplant · Jun 4 – Jun 18
BeansSow outdoors · May 28 – Jun 11
Sweet cornSow outdoors · May 28 – Jun 11
Cucumbers, squashSow outdoors · May 28 – Jun 11
Fall lettuce, spinachSow outdoors · Aug 1 – Aug 15
GarlicPlant cloves · Sep 12 – Oct 17
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 21) and first fall frost (Sep 26) 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 03749 came on Apr 16 — 7 days earlier than the 1991–2020 average (Apr 23).

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 Enfield Center, NH

The soil mapped at the center of ZIP 03749 is Becket — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH6.0slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter7%high
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Becket fine sandy loam, 8 to 15 percent slopes.

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 03749; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Enfield Center, NH

Summer high80 °Faverage high, July
Winter low7 °Faverage low, January
Hot days5days a year at 90 °F or more
Freezing nights199nights a year at 32 °F or less
Growing degree days1,846base 50 °F — the season’s usable heat
Longest day15 h 26 mindaylight on June 21
Shortest day8 h 56 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation40.2 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 29 °F, low 7 °F 29°7° JanFebruary: average high 32 °F, low 7 °F 32°7° FebMarch: average high 40 °F, low 17 °F 40°17° MarApril: average high 54 °F, low 28 °F 54°28° AprMay: average high 66 °F, low 40 °F 66°40° MayJune: average high 75 °F, low 50 °F 75°50° JunJuly: average high 80 °F, low 54 °F 80°54° JulAugust: average high 78 °F, low 53 °F 78°53° AugSeptember: average high 71 °F, low 45 °F 71°45° SepOctober: average high 58 °F, low 33 °F 58°33° OctNovember: average high 45 °F, low 25 °F 45°25° NovDecember: average high 34 °F, low 15 °F 34°15° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.93 in precipitation 2.9 JanFebruary: 2.55 in precipitation 2.5 FebMarch: 3.05 in precipitation 3.0 MarApril: 3.20 in precipitation 3.2 AprMay: 3.18 in precipitation 3.2 MayJune: 4.21 in precipitation 4.2 JunJuly: 3.89 in precipitation 3.9 JulAugust: 3.32 in precipitation 3.3 AugSeptember: 3.23 in precipitation 3.2 SepOctober: 4.51 in precipitation 4.5 OctNovember: 3.11 in precipitation 3.1 NovDecember: 2.98 in precipitation 3.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Grafton, NH (7 mi away); precipitation: Grafton, NH (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

037485a
Enfield, NH · 2 mi
037535a
Grantham, NH · 5 mi
032405a
Grafton, NH · 7 mi
037415a
Canaan, NH · 8 mi
032845b
Springfield, NH · 8 mi
037665a
Lebanon, NH · 8 mi
037705a
Meriden, NH · 9 mi
037515b
Georges Mills, NH · 10 mi

New Hampshire planting zones →

Questions about 03749

What planting zone is ZIP code 03749?

ZIP code 03749 (Enfield Center, NH) is in USDA hardiness zone 5a on the 2023 map: the coldest night of an average winter reaches −20 to −15 °F (−28.9 to −26.1 °C).

When is the last frost in Enfield Center, NH?

The median last spring frost (32 °F) near 03749 is May 21; after June 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Grafton station.

When is the first frost in Enfield Center, NH?

The median first fall frost near 03749 is September 26, giving a median frost-free growing season of 127 days.

When should I plant tomatoes in 03749?

Start tomato seeds indoors around Mar 26 – Apr 9 and set transplants outside around May 28 – Jun 11, one to three weeks after the median last frost.

How much rain and snow does 03749 get?

About 40.2 inches of precipitation a year (NOAA 1991–2020 normals, Grafton station).

How hot do summers get in Enfield Center, NH?

The average high peaks at 80 °F in July, with about 5 days a year at 90 °F or more.

What kind of soil does 03749 have?

The USDA soil survey maps Becket at the center of ZIP 03749: fine sandy loam, well drained, pH about 6.0 (slightly acidic).

Did spring come early in Enfield Center, NH in 2026?

Spring leaf-out near 03749 came on Apr 16 in 2026, 7 days earlier than the 1991–2020 average (Apr 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Enfield Center, NH?

Long-day onions: the longest day near 03749 is 15 h 26 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).