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

Planting zone for Southampton, NY

Southampton, NY is in USDA zones 7a to 7b across its 2 ZIP codes. The median last spring frost is April 19 and the first fall frost November 1.

Southampton on the zone map

Outlined: its 1 ZIP code areas · 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.

Zones7a–7b0 to 10 °F

ZIP codes2

Last frostApr 19

First frostNov 1

Growing season196 days

7a 1 ZIP 7b 1 ZIP

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Southampton, NY…

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 Southampton, NY

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 19median — 50% chance of a later frost

Safe for tender plantsMay 4only 10% chance of frost after

First fall frostNovember 1median — 10% chance by Oct 17

Growing season196 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around November 12.

From the NOAA station Mattituck, NY, elevation 20 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 Southampton

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 8 – Mar 22

SpinachSow outdoors · Mar 8 – Mar 29

Broccoli, cabbageStart indoors · Feb 8 – Feb 22

Broccoli, cabbageTransplant · Mar 29 – Apr 12

Onion setsPlant outdoors · Mar 22 – Apr 5

PotatoesPlant outdoors · Mar 29 – Apr 12

LettuceSow outdoors · Mar 22 – Apr 5

Carrots, beetsSow outdoors · Mar 29 – Apr 12

TomatoesStart indoors · Feb 22 – Mar 8

TomatoesTransplant · Apr 26 – May 10

Peppers, eggplantStart indoors · Feb 8 – Feb 22

Peppers, eggplantTransplant · May 3 – May 17

BeansSow outdoors · Apr 26 – May 10

Sweet cornSow outdoors · Apr 26 – May 10

Cucumbers, squashSow outdoors · Apr 26 – May 10

Fall lettuce, spinachSow outdoors · Sep 6 – Sep 20

GarlicPlant cloves · Oct 18 – Nov 22

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 19) and first fall frost (Nov 1) 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 11968 came on Apr 5 — about the same time as the 1991–2020 average (Apr 3).

average
Apr 32026
Apr 5

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 7a in New York

656 plants native to the lower 48 states, recorded in New York, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 Southampton, NY.

Soil in Southampton, NY

The soil mapped at the center of ZIP 11968 is Plymouth — slightly decomposed plant material, excessively drained.

TextureSlightly decomposed plant materialtop layer

DrainageExcessively drainednatural drainage class

Organic matter80%high

Hydrologic groupAwater soaks in fast

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Plymouth loamy coarse sand, 0 to 3 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 11968; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Southampton, NY

Summer high82 °Faverage high, July

Winter low23 °Faverage low, January

Hot days7days a year at 90 °F or more

Freezing nights105nights a year at 32 °F or less

Growing degree days2,921base 50 °F — the season’s usable heat

Longest day15 h 07 mindaylight on June 21

Shortest day9 h 14 mindaylight on December 21

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

Precipitation45 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: Mattituck, NY (7 mi away); precipitation: Mattituck, NY (7 mi away). Daylight is calculated from latitude.

ZIP codes in Southampton

New York planting zones →

Questions about Southampton

What planting zone is Southampton, NY?

Southampton, NY is in USDA hardiness zones 7a to 7b on the 2023 map (7a: 0 to 5 °F; 7b: 5 to 10 °F).

When is the last frost in Southampton, NY?

The median last spring frost is April 19 and the median first fall frost is November 1 (NOAA 1991–2020 normals, Mattituck station).

When can I plant a garden in Southampton, NY?

Cool-season crops like peas and spinach go in around Mar 8 – Mar 29; tomatoes, peppers, beans and squash after about Apr 26, once frost risk has passed.

What kind of onions grow in Southampton, NY?

Long-day onions: the longest day is 15 h 07 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Southampton, NY get?

About 45 inches of precipitation a year (NOAA 1991–2020 normals).