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

Planting zone for 03585 — Lisbon, NH

ZIP code 03585 (Lisbon, Grafton County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 24 and the first fall frost September 18.

Where ZIP 03585 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.

Zone5a−20 to −15 °F

Coldest night−28.9 to −26.1 °C

Last frostMay 24

First frostSep 18

2012 zone4b

Was 4b 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 5a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Lisbon, 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 Lisbon, NH

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 24median — 50% chance of a later frost

Safe for tender plantsJune 8only 10% chance of frost after

First fall frostSeptember 18median — 10% chance by Sep 6

Growing season116 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 7 and returns around September 30.

From the NOAA station Bethlehem 2, NH — 14 miles away, elevation 1,181 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 03585

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 12 – Apr 26

SpinachSow outdoors · Apr 12 – May 3

Broccoli, cabbageStart indoors · Mar 15 – Mar 29

Broccoli, cabbageTransplant · May 3 – May 17

Onion setsPlant outdoors · Apr 26 – May 10

PotatoesPlant outdoors · May 3 – May 17

LettuceSow outdoors · Apr 26 – May 10

Carrots, beetsSow outdoors · May 3 – May 17

TomatoesStart indoors · Mar 29 – Apr 12

TomatoesTransplant · May 31 – Jun 14

Peppers, eggplantStart indoors · Mar 15 – Mar 29

Peppers, eggplantTransplant · Jun 7 – Jun 21

BeansSow outdoors · May 31 – Jun 14

Sweet cornSow outdoors · May 31 – Jun 14

Cucumbers, squashSow outdoors · May 31 – Jun 14

Fall lettuce, spinachSow outdoors · Jul 24 – Aug 7

GarlicPlant cloves · Sep 4 – Oct 9

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 24) and first fall frost (Sep 18) 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 03585 came on Apr 16 — 8 days earlier than the 1991–2020 average (Apr 24).

average
Apr 242026
Apr 16

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 5a in New Hampshire

467 plants native to the lower 48 states, recorded in New Hampshire, and rated by the USDA to survive −20 °F or colder — the bottom of zone 5a. Each links to its USDA PLANTS profile.

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 Lisbon, NH.

Soil in Lisbon, NH

The soil mapped at the center of ZIP 03585 is Kinsman — sand, poorly drained.

TextureSanddrains and warms fast; dries out and needs more feeding

pH4.6strongly acidic; most vegetables like 6.0–7.0

DrainagePoorly drainedconsider raised beds

Organic matter9%high

Hydrologic groupA/Ddrains fast once dried out; wet otherwise

Farmland classFarmland of local importanceUSDA classification

Map unit: Kinsman sand.

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 03585; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Lisbon, NH

Summer high80 °Faverage high, July

Winter low3 °Faverage low, January

Hot days3days a year at 90 °F or more

Freezing nights191nights a year at 32 °F or less

Growing degree days1,780base 50 °F — the season’s usable heat

Longest day15 h 31 mindaylight on June 21

Shortest day8 h 51 mindaylight on December 21

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

Precipitation41 inper year, rain and melted snow

Snowfall101 inper year; 120 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bethlehem 2, NH (14 mi away); precipitation: Bethlehem 2, NH (14 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.

037405a

Bath, NH · 5 mi

035865a

Sugar Hill, NH · 5 mi

037714b

Monroe, NH · 6 mi

050504b

Mc Indoe Falls, VT · 8 mi

037745a

North Haverhill, NH · 10 mi

035614b

Littleton, NH · 10 mi

050424b

East Ryegate, VT · 10 mi

058484b

Lower Waterford, VT · 11 mi

New Hampshire planting zones →

Questions about 03585

What planting zone is ZIP code 03585?

ZIP code 03585 (Lisbon, 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 Lisbon, NH?

The median last spring frost (32 °F) near 03585 is May 24; after June 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bethlehem 2 station.

When is the first frost in Lisbon, NH?

The median first fall frost near 03585 is September 18, giving a median frost-free growing season of 116 days.

When should I plant tomatoes in 03585?

Start tomato seeds indoors around Mar 29 – Apr 12 and set transplants outside around May 31 – Jun 14, one to three weeks after the median last frost.

How much rain and snow does 03585 get?

About 41 inches of precipitation a year and 101 inches of snowfall (NOAA 1991–2020 normals, Bethlehem 2 station).

How hot do summers get in Lisbon, NH?

The average high peaks at 80 °F in July, with about 3 days a year at 90 °F or more.

What kind of soil does 03585 have?

The USDA soil survey maps Kinsman at the center of ZIP 03585: sand, poorly drained, pH about 4.6 (strongly acidic).

Did spring come early in Lisbon, NH in 2026?

Spring leaf-out near 03585 came on Apr 16 in 2026, 8 days earlier than the 1991–2020 average (Apr 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Lisbon, NH?

Long-day onions: the longest day near 03585 is 15 h 31 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 03585 change?

Yes. The 2012 USDA map put 03585 in zone 4b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.