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

Planting zone for 03570 — Berlin, NH

ZIP code 03570 (Berlin, Coos County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 14 and the first fall frost September 30.

Where ZIP 03570 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 14
First frostSep 30
2012 zone4b

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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Berlin, 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 Berlin, NH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 14median — 50% chance of a later frost
Safe for tender plantsMay 30only 10% chance of frost after
First fall frostSeptember 30median — 10% chance by Sep 15
Growing season135 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 30 and returns around October 10.

From the NOAA station Berlin, NH — 4 miles away, elevation 919 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 03570

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 2 – Apr 16
SpinachSow outdoors · Apr 2 – Apr 23
Broccoli, cabbageStart indoors · Mar 5 – Mar 19
Broccoli, cabbageTransplant · Apr 23 – May 7
Onion setsPlant outdoors · Apr 16 – Apr 30
PotatoesPlant outdoors · Apr 23 – May 7
LettuceSow outdoors · Apr 16 – Apr 30
Carrots, beetsSow outdoors · Apr 23 – May 7
TomatoesStart indoors · Mar 19 – Apr 2
TomatoesTransplant · May 21 – Jun 4
Peppers, eggplantStart indoors · Mar 5 – Mar 19
Peppers, eggplantTransplant · May 28 – Jun 11
BeansSow outdoors · May 21 – Jun 4
Sweet cornSow outdoors · May 21 – Jun 4
Cucumbers, squashSow outdoors · May 21 – Jun 4
Fall lettuce, spinachSow outdoors · Aug 5 – Aug 19
GarlicPlant cloves · Sep 16 – Oct 21
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 14) and first fall frost (Sep 30) 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 03570 came on Apr 16 — 11 days earlier than the 1991–2020 average (Apr 27).

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 4b in New Hampshire

438 plants native to the lower 48 states, recorded in New Hampshire, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. Each links to its USDA PLANTS profile.

Trees 52

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 83

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 153

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 134

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 5

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 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °FVirginia creeper1 ft · blooms late spring · medium shade tolerance · to −28 °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 Berlin, NH.

Soil in Berlin, NH

The soil mapped at the center of ZIP 03570 is Skerry — highly decomposed plant material, moderately well drained.

TextureHighly decomposed plant materialtop layer
pH4.9strongly acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter80%high
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Skerry fine sandy loam, 8 to 15 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 03570; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Berlin, NH

Summer high78 °Faverage high, July
Winter low5 °Faverage low, January
Hot days2days a year at 90 °F or more
Freezing nights174nights a year at 32 °F or less
Growing degree days1,804base 50 °F — the season’s usable heat
Longest day15 h 33 mindaylight on June 21
Shortest day8 h 49 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation42.6 inper year, rain and melted snow
Snowfall82 inper year; 115 days with snow on the ground

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 27 °F, low 5 °F 27°5° JanFebruary: average high 30 °F, low 6 °F 30°6° FebMarch: average high 38 °F, low 16 °F 38°16° MarApril: average high 52 °F, low 29 °F 52°29° AprMay: average high 66 °F, low 41 °F 66°41° MayJune: average high 74 °F, low 50 °F 74°50° JunJuly: average high 78 °F, low 55 °F 78°55° JulAugust: average high 77 °F, low 53 °F 77°53° AugSeptember: average high 70 °F, low 45 °F 70°45° SepOctober: average high 57 °F, low 35 °F 57°35° OctNovember: average high 44 °F, low 26 °F 44°26° NovDecember: average high 32 °F, low 14 °F 32°14° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.73 in precipitation, 18.2 in snowfall 2.7❄18 JanFebruary: 2.44 in precipitation, 21 in snowfall 2.4❄21 FebMarch: 3.00 in precipitation, 16.1 in snowfall 3.0❄16 MarApril: 3.43 in precipitation, 4.2 in snowfall 3.4❄4 AprMay: 3.55 in precipitation, 0.2 in snowfall 3.5 MayJune: 4.23 in precipitation 4.2 JunJuly: 4.08 in precipitation 4.1 JulAugust: 3.75 in precipitation 3.8 AugSeptember: 3.35 in precipitation 3.4 SepOctober: 4.92 in precipitation, 0.5 in snowfall 4.9❄1 OctNovember: 3.39 in precipitation, 4.6 in snowfall 3.4❄5 NovDecember: 3.73 in precipitation, 17.2 in snowfall 3.7❄17 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Berlin, NH (4 mi away); precipitation: Berlin, NH (4 mi away). 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.

035884b
Milan, NH · 7 mi
035815a
Gorham, NH · 11 mi
042615a
Newry, ME · 12 mi
035824b
Groveton, NH · 13 mi
035834b
Jefferson, NH · 15 mi
035935a
Randolph, NH · 15 mi
035894a
Mount Washington, NH · 16 mi
035755a
Bretton Woods, NH · 17 mi

New Hampshire planting zones →

Questions about 03570

What planting zone is ZIP code 03570?

ZIP code 03570 (Berlin, 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 Berlin, NH?

The median last spring frost (32 °F) near 03570 is May 14; after May 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Berlin station.

When is the first frost in Berlin, NH?

The median first fall frost near 03570 is September 30, giving a median frost-free growing season of 135 days.

When should I plant tomatoes in 03570?

Start tomato seeds indoors around Mar 19 – Apr 2 and set transplants outside around May 21 – Jun 4, one to three weeks after the median last frost.

How much rain and snow does 03570 get?

About 42.6 inches of precipitation a year and 82 inches of snowfall (NOAA 1991–2020 normals, Berlin station).

How hot do summers get in Berlin, NH?

The average high peaks at 78 °F in July, with about 2 days a year at 90 °F or more.

What kind of soil does 03570 have?

The USDA soil survey maps Skerry at the center of ZIP 03570: highly decomposed plant material, moderately well drained, pH about 4.9 (strongly acidic).

Did spring come early in Berlin, NH in 2026?

Spring leaf-out near 03570 came on Apr 16 in 2026, 11 days earlier than the 1991–2020 average (Apr 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Berlin, NH?

Long-day onions: the longest day near 03570 is 15 h 33 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).