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

Planting zone for 06390 — Fishers Island, NY

ZIP code 06390 (Fishers Island, Suffolk County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 16 and the first fall frost October 28.

Where ZIP 06390 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 16
First frostOct 28
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 Fishers Island, 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 Fishers Island, NY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 16median — 50% chance of a later frost
Safe for tender plantsApril 30only 10% chance of frost after
First fall frostOctober 28median — 10% chance by Oct 13
Growing season194 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 3 and returns around November 9.

From the NOAA station Groton New London Airport, CT — 7 miles away, elevation 10 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 06390

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 5 – Mar 19
SpinachSow outdoors · Mar 5 – Mar 26
Broccoli, cabbageStart indoors · Feb 5 – Feb 19
Broccoli, cabbageTransplant · Mar 26 – Apr 9
Onion setsPlant outdoors · Mar 19 – Apr 2
PotatoesPlant outdoors · Mar 26 – Apr 9
LettuceSow outdoors · Mar 19 – Apr 2
Carrots, beetsSow outdoors · Mar 26 – Apr 9
TomatoesStart indoors · Feb 19 – Mar 5
TomatoesTransplant · Apr 23 – May 7
Peppers, eggplantStart indoors · Feb 5 – Feb 19
Peppers, eggplantTransplant · Apr 30 – May 14
BeansSow outdoors · Apr 23 – May 7
Sweet cornSow outdoors · Apr 23 – May 7
Cucumbers, squashSow outdoors · Apr 23 – May 7
Fall lettuce, spinachSow outdoors · Sep 2 – Sep 16
GarlicPlant cloves · Oct 14 – Nov 18
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Oct 28) 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 06390 came on Apr 6 — 4 days later than the 1991–2020 average (Apr 2).

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 Fishers Island, NY.

Soil in Fishers Island, NY

The soil mapped at the center of ZIP 06390 is Riverhead — sandy loam, well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding
pH5.2strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupAwater soaks in fast
Farmland classprime farmlandUSDA classification

Map unit: Riverhead sandy loam, 3 to 8 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 06390; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Fishers Island, NY

Summer high80 °Faverage high, July
Winter low23 °Faverage low, January
Hot days2days a year at 90 °F or more
Freezing nights107nights a year at 32 °F or less
Growing degree days2,786base 50 °F — the season’s usable heat
Longest day15 h 10 mindaylight on June 21
Shortest day9 h 11 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation46.6 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 38 °F, low 23 °F 38°23° JanFebruary: average high 40 °F, low 25 °F 40°25° FebMarch: average high 47 °F, low 31 °F 47°31° MarApril: average high 56 °F, low 39 °F 56°39° AprMay: average high 65 °F, low 49 °F 65°49° MayJune: average high 74 °F, low 58 °F 74°58° JunJuly: average high 80 °F, low 65 °F 80°65° JulAugust: average high 79 °F, low 64 °F 79°64° AugSeptember: average high 74 °F, low 57 °F 74°57° SepOctober: average high 63 °F, low 46 °F 63°46° OctNovember: average high 53 °F, low 37 °F 53°37° NovDecember: average high 44 °F, low 29 °F 44°29° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.79 in precipitation 3.8 JanFebruary: 3.19 in precipitation 3.2 FebMarch: 3.89 in precipitation 3.9 MarApril: 4.05 in precipitation 4.0 AprMay: 3.73 in precipitation 3.7 MayJune: 4.20 in precipitation 4.2 JunJuly: 3.23 in precipitation 3.2 JulAugust: 4.07 in precipitation 4.1 AugSeptember: 4.35 in precipitation 4.3 SepOctober: 4.26 in precipitation 4.3 OctNovember: 3.93 in precipitation 3.9 NovDecember: 3.95 in precipitation 4.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Groton New London Airport, CT (7 mi away); precipitation: Fishers Island 0.5 Ne, NY (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

063887a
West Mystic, CT · 4 mi
063557a
Mystic, CT · 6 mi
063787a
Stonington, CT · 7 mi
063797a
Pawcatuck, CT · 7 mi
063727a
Old Mystic, CT · 7 mi
063407a
Groton, CT · 7 mi
028917a
Westerly, RI · 9 mi
063207a
New London, CT · 10 mi

New York planting zones →

Questions about 06390

What planting zone is ZIP code 06390?

ZIP code 06390 (Fishers Island, 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 Fishers Island, NY?

The median last spring frost (32 °F) near 06390 is April 16; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Groton New London Airport station.

When is the first frost in Fishers Island, NY?

The median first fall frost near 06390 is October 28, giving a median frost-free growing season of 194 days.

When should I plant tomatoes in 06390?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 06390 get?

About 46.6 inches of precipitation a year (NOAA 1991–2020 normals, Fishers Island 0.5 Ne station).

How hot do summers get in Fishers Island, NY?

The average high peaks at 80 °F in July, with about 2 days a year at 90 °F or more.

What kind of soil does 06390 have?

The USDA soil survey maps Riverhead at the center of ZIP 06390: sandy loam, well drained, pH about 5.2 (strongly acidic).

Did spring come early in Fishers Island, NY in 2026?

Spring leaf-out near 06390 came on Apr 6 in 2026, 4 days later than the 1991–2020 average (Apr 2), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Fishers Island, NY?

Long-day onions: the longest day near 06390 is 15 h 10 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).