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

Planting zone for 11963 — Sag Harbor, NY

ZIP code 11963 (Sag Harbor, Suffolk County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 23 and the first fall frost October 24.

Where ZIP 11963 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 23
First frostOct 24
2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Sag Harbor, 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 Sag Harbor, NY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 23median — 50% chance of a later frost
Safe for tender plantsMay 8only 10% chance of frost after
First fall frostOctober 24median — 10% chance by Oct 11
Growing season182 daysfrost-free, median

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

From the NOAA station Bridgehampton, NY — 4 miles away, elevation 43 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 11963

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 12 – Mar 26
SpinachSow outdoors · Mar 12 – Apr 2
Broccoli, cabbageStart indoors · Feb 12 – Feb 26
Broccoli, cabbageTransplant · Apr 2 – Apr 16
Onion setsPlant outdoors · Mar 26 – Apr 9
PotatoesPlant outdoors · Apr 2 – Apr 16
LettuceSow outdoors · Mar 26 – Apr 9
Carrots, beetsSow outdoors · Apr 2 – Apr 16
TomatoesStart indoors · Feb 26 – Mar 12
TomatoesTransplant · Apr 30 – May 14
Peppers, eggplantStart indoors · Feb 12 – Feb 26
Peppers, eggplantTransplant · May 7 – May 21
BeansSow outdoors · Apr 30 – May 14
Sweet cornSow outdoors · Apr 30 – May 14
Cucumbers, squashSow outdoors · Apr 30 – May 14
Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12
GarlicPlant cloves · Oct 10 – Nov 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 23) and first fall frost (Oct 24) 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 11963 came on Apr 6 — 3 days later than the 1991–2020 average (Apr 3).

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.

Trees 78

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 131

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °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 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 221

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 200

alkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAmerican beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °FAtlantic mannagrass3 ft · blooms summer · low shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °F

Vines 9

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °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 Sag Harbor, NY.

Soil in Sag Harbor, NY

The center of ZIP 11963 is mapped as Beaches, sand: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 11963; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Sag Harbor, NY

Summer high81 °Faverage high, July
Winter low23 °Faverage low, January
Hot days5days a year at 90 °F or more
Freezing nights106nights a year at 32 °F or less
Growing degree days2,678base 50 °F — the season’s usable heat
Longest day15 h 08 mindaylight on June 21
Shortest day9 h 13 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation49.8 inper year, rain and melted snow
Snowfall27 inper year; 21 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 39 °F, low 23 °F 39°23° JanFebruary: average high 40 °F, low 24 °F 40°24° FebMarch: average high 46 °F, low 30 °F 46°30° MarApril: average high 55 °F, low 38 °F 55°38° AprMay: average high 65 °F, low 47 °F 65°47° MayJune: average high 75 °F, low 57 °F 75°57° JunJuly: average high 81 °F, low 64 °F 81°64° JulAugust: average high 80 °F, low 62 °F 80°62° AugSeptember: average high 73 °F, low 56 °F 73°56° SepOctober: average high 63 °F, low 45 °F 63°45° OctNovember: average high 53 °F, low 36 °F 53°36° NovDecember: average high 44 °F, low 28 °F 44°28° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 4.05 in precipitation, 7.2 in snowfall 4.0❄7 JanFebruary: 3.61 in precipitation, 8.6 in snowfall 3.6❄9 FebMarch: 4.94 in precipitation, 6 in snowfall 4.9❄6 MarApril: 4.34 in precipitation, 0.8 in snowfall 4.3❄1 AprMay: 3.57 in precipitation 3.6 MayJune: 3.86 in precipitation 3.9 JunJuly: 3.16 in precipitation 3.2 JulAugust: 3.94 in precipitation 3.9 AugSeptember: 4.79 in precipitation 4.8 SepOctober: 4.72 in precipitation 4.7 OctNovember: 3.81 in precipitation, 0.1 in snowfall 3.8 NovDecember: 4.97 in precipitation, 4.1 in snowfall 5.0❄4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bridgehampton, NY (4 mi away); precipitation: Bridgehampton, NY (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

119647b
Shelter Island, NY · 3 mi
119757b
Wainscott, NY · 5 mi
119767b
Water Mill, NY · 5 mi
119327b
Bridgehampton, NY · 5 mi
119627b
Sagaponack, NY · 6 mi
119657b
Shelter Island Heights, NY · 6 mi
119377b
East Hampton, NY · 6 mi
119717b
Southold, NY · 7 mi

New York planting zones →

Questions about 11963

What planting zone is ZIP code 11963?

ZIP code 11963 (Sag Harbor, NY) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Sag Harbor, NY?

The median last spring frost (32 °F) near 11963 is April 23; after May 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bridgehampton station.

When is the first frost in Sag Harbor, NY?

The median first fall frost near 11963 is October 24, giving a median frost-free growing season of 182 days.

When should I plant tomatoes in 11963?

Start tomato seeds indoors around Feb 26 – Mar 12 and set transplants outside around Apr 30 – May 14, one to three weeks after the median last frost.

How much rain and snow does 11963 get?

About 49.8 inches of precipitation a year and 27 inches of snowfall (NOAA 1991–2020 normals, Bridgehampton station).

How hot do summers get in Sag Harbor, NY?

The average high peaks at 81 °F in July, with about 5 days a year at 90 °F or more.

Did spring come early in Sag Harbor, NY in 2026?

Spring leaf-out near 11963 came on Apr 6 in 2026, 3 days later than the 1991–2020 average (Apr 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Sag Harbor, NY?

Long-day onions: the longest day near 11963 is 15 h 08 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).