Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 03579 — Errol, NH

ZIP code 03579 (Errol, Coos County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 21 and the first fall frost September 22.

Where ZIP 03579 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.

Zone4b−25 to −20 °F

Coldest night−31.7 to −28.9 °C

Last frostMay 21

First frostSep 22

2012 zone4a

Was 4a 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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Errol, 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 Errol, 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 3only 10% chance of frost after

First fall frostSeptember 22median — 10% chance by Sep 9

Growing season123 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 8 and returns around October 2.

From the NOAA station Errol Airport, NH — 12 miles away, elevation 1,240 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 03579

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 · Jul 28 – Aug 11

GarlicPlant cloves · Sep 8 – Oct 13

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 21) and first fall frost (Sep 22) 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 03579 came on Apr 28 — 5 days earlier than the 1991–2020 average (May 3).

average
May 32026
Apr 28

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 Errol, NH

The soil mapped at the center of ZIP 03579 is Tunbridge — moderately decomposed plant material, well drained.

TextureModerately decomposed plant materialtop layer

pH3.5strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter85%high

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Tunbridge-Plaisted association, 15 to 35 percent slopes, very stony.

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 03579; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Errol, NH

Summer high77 °Faverage high, July

Winter low−1 °Faverage low, February

Hot days1days a year at 90 °F or more

Freezing nights197nights a year at 32 °F or less

Growing degree days1,481base 50 °F — the season’s usable heat

Longest day15 h 37 mindaylight on June 21

Shortest day8 h 46 mindaylight on December 21

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

Precipitation46.7 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Errol Airport, NH (12 mi away); precipitation: Lincoln Plantation, ME (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

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

049644b

Oquossoc, ME · 11 mi

035924a

Pittsburg, NH · 16 mi

035764a

Colebrook, NH · 17 mi

042164b

Andover, ME · 20 mi

035974a

West Stewartstown, NH · 21 mi

059024a

Beecher Falls, VT · 22 mi

035894a

Mount Washington, NH · 24 mi

035884b

Milan, NH · 25 mi

New Hampshire planting zones →

Questions about 03579

What planting zone is ZIP code 03579?

ZIP code 03579 (Errol, NH) is in USDA hardiness zone 4b on the 2023 map: the coldest night of an average winter reaches −25 to −20 °F (−31.7 to −28.9 °C).

When is the last frost in Errol, NH?

The median last spring frost (32 °F) near 03579 is May 21; after June 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Errol Airport station.

When is the first frost in Errol, NH?

The median first fall frost near 03579 is September 22, giving a median frost-free growing season of 123 days.

When should I plant tomatoes in 03579?

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 03579 get?

About 46.7 inches of precipitation a year (NOAA 1991–2020 normals, Lincoln Plantation station).

How hot do summers get in Errol, NH?

The average high peaks at 77 °F in July, with about 1 days a year at 90 °F or more.

What kind of soil does 03579 have?

The USDA soil survey maps Tunbridge at the center of ZIP 03579: moderately decomposed plant material, well drained, pH about 3.5 (strongly acidic).

Did spring come early in Errol, NH in 2026?

Spring leaf-out near 03579 came on Apr 28 in 2026, 5 days earlier than the 1991–2020 average (May 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Errol, NH?

Long-day onions: the longest day near 03579 is 15 h 37 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 03579 change?

Yes. The 2012 USDA map put 03579 in zone 4a; the 2023 map puts it in zone 4b. The newer map uses 1991–2020 data and more weather stations.