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

Planting zone for Syosset, NY

Syosset, NY is in USDA zone 7b across its 2 ZIP codes. The median last spring frost is April 6 and the first fall frost November 6.

Syosset 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.

Zone7b5 to 10 °F

ZIP codes2

Last frostApr 6

First frostNov 6

Growing season213 days

7b 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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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 Syosset, NY

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 6median — 50% chance of a later frost

Safe for tender plantsApril 20only 10% chance of frost after

First fall frostNovember 6median — 10% chance by Oct 25

Growing season213 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 27 and returns around November 19.

From the NOAA station Farmingdale Airport, NY, elevation 82 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 Syosset

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 23 – Mar 9

SpinachSow outdoors · Feb 23 – Mar 16

Broccoli, cabbageStart indoors · Jan 26 – Feb 9

Broccoli, cabbageTransplant · Mar 16 – Mar 30

Onion setsPlant outdoors · Mar 9 – Mar 23

PotatoesPlant outdoors · Mar 16 – Mar 30

LettuceSow outdoors · Mar 9 – Mar 23

Carrots, beetsSow outdoors · Mar 16 – Mar 30

TomatoesStart indoors · Feb 9 – Feb 23

TomatoesTransplant · Apr 13 – Apr 27

Peppers, eggplantStart indoors · Jan 26 – Feb 9

Peppers, eggplantTransplant · Apr 20 – May 4

BeansSow outdoors · Apr 13 – Apr 27

Sweet cornSow outdoors · Apr 13 – Apr 27

Cucumbers, squashSow outdoors · Apr 13 – Apr 27

Fall lettuce, spinachSow outdoors · Sep 11 – Sep 25

GarlicPlant cloves · Oct 23 – Nov 27

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 6) and first fall frost (Nov 6) 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 11791 came on Apr 1 — 7 days later than the 1991–2020 average (Mar 25).

average
Mar 252026
Apr 1

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 7b in New York

660 plants native to the lower 48 states, recorded in New York, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. 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 Syosset, NY.

Soil in Syosset, NY

The center of ZIP 11791 is mapped as Urban land: 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 11791; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Syosset, NY

Summer high83 °Faverage high, July

Winter low25 °Faverage low, January

Hot days11days a year at 90 °F or more

Freezing nights88nights a year at 32 °F or less

Growing degree days3,244base 50 °F — the season’s usable heat

Longest day15 h 06 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)

Precipitation47.7 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: Centerport, NY (8 mi away); precipitation: Syosset, NY (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Syosset

New York planting zones →

Questions about Syosset

What planting zone is Syosset, NY?

Syosset, NY is in USDA hardiness zone 7b on the 2023 map (7b: 5 to 10 °F).

When is the last frost in Syosset, NY?

The median last spring frost is April 6 and the median first fall frost is November 6 (NOAA 1991–2020 normals, Farmingdale Airport station).

When can I plant a garden in Syosset, NY?

Cool-season crops like peas and spinach go in around Feb 23 – Mar 16; tomatoes, peppers, beans and squash after about Apr 13, once frost risk has passed.

What kind of onions grow in Syosset, NY?

Long-day onions: the longest day is 15 h 06 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Syosset, NY get?

About 47.7 inches of precipitation a year (NOAA 1991–2020 normals).