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

Planting zone for 10528 — Harrison, NY

ZIP code 10528 (Harrison, Westchester County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 20 and the first fall frost October 26.

Where ZIP 10528 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.

Zone7b5 to 10 °F

Coldest night−15 to −12.2 °C

Last frostApr 20

First frostOct 26

2012 zone7a

Was 7a 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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Harrison, 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 Harrison, NY

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 20median — 50% chance of a later frost

Safe for tender plantsMay 6only 10% chance of frost after

First fall frostOctober 26median — 10% chance by Oct 10

Growing season189 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around November 7.

From the NOAA station Dobbs Ferry-Ardsley, NY — 6 miles away, elevation 200 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 10528

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 9 – Mar 23

SpinachSow outdoors · Mar 9 – Mar 30

Broccoli, cabbageStart indoors · Feb 9 – Feb 23

Broccoli, cabbageTransplant · Mar 30 – Apr 13

Onion setsPlant outdoors · Mar 23 – Apr 6

PotatoesPlant outdoors · Mar 30 – Apr 13

LettuceSow outdoors · Mar 23 – Apr 6

Carrots, beetsSow outdoors · Mar 30 – Apr 13

TomatoesStart indoors · Feb 23 – Mar 9

TomatoesTransplant · Apr 27 – May 11

Peppers, eggplantStart indoors · Feb 9 – Feb 23

Peppers, eggplantTransplant · May 4 – May 18

BeansSow outdoors · Apr 27 – May 11

Sweet cornSow outdoors · Apr 27 – May 11

Cucumbers, squashSow outdoors · Apr 27 – May 11

Fall lettuce, spinachSow outdoors · Aug 31 – Sep 14

GarlicPlant cloves · Oct 12 – Nov 16

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 20) and first fall frost (Oct 26) 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 10528 came on Mar 31 — 6 days later than the 1991–2020 average (Mar 25).

average
Mar 252026
Mar 31

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 Harrison, NY.

Soil in Harrison, NY

The soil mapped at the center of ZIP 10528 is Udorthents — gravelly loam, somewhat poorly drained.

TextureGravelly loama good balance for most vegetables

pH5.9moderately acidic; most vegetables like 6.0–7.0

DrainageSomewhat poorly drainedconsider raised beds

Organic matter4%moderate

Hydrologic groupA/Ddrains fast once dried out; wet otherwise

Farmland classNot prime farmlandUSDA classification

Map unit: Udorthents, wet substratum.

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 10528; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Harrison, NY

Summer high86 °Faverage high, July

Winter low23 °Faverage low, January

Hot days19days a year at 90 °F or more

Freezing nights109nights a year at 32 °F or less

Growing degree days3,333base 50 °F — the season’s usable heat

Longest day15 h 07 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)

Precipitation51.2 inper year, rain and melted snow

Snowfall33 inper year; 39 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: Dobbs Ferry-Ardsley, NY (6 mi away); precipitation: Dobbs Ferry-Ardsley, NY (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

105437b

Mamaroneck, NY · 2 mi

105807b

Rye, NY · 2 mi

106057a

White Plains, NY · 3 mi

Port Chester, NY · 4 mi

108047b

New Rochelle, NY · 4 mi

106067a

White Plains, NY · 4 mi

New York planting zones →

Questions about 10528

What planting zone is ZIP code 10528?

ZIP code 10528 (Harrison, NY) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Harrison, NY?

The median last spring frost (32 °F) near 10528 is April 20; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Dobbs Ferry-Ardsley station.

When is the first frost in Harrison, NY?

The median first fall frost near 10528 is October 26, giving a median frost-free growing season of 189 days.

When should I plant tomatoes in 10528?

Start tomato seeds indoors around Feb 23 – Mar 9 and set transplants outside around Apr 27 – May 11, one to three weeks after the median last frost.

How much rain and snow does 10528 get?

About 51.2 inches of precipitation a year and 33 inches of snowfall (NOAA 1991–2020 normals, Dobbs Ferry-Ardsley station).

How hot do summers get in Harrison, NY?

The average high peaks at 86 °F in July, with about 19 days a year at 90 °F or more.

What kind of soil does 10528 have?

The USDA soil survey maps Udorthents at the center of ZIP 10528: gravelly loam, somewhat poorly drained, pH about 5.9 (moderately acidic).

Did spring come early in Harrison, NY in 2026?

Spring leaf-out near 10528 came on Mar 31 in 2026, 6 days later than the 1991–2020 average (Mar 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Harrison, NY?

Long-day onions: the longest day near 10528 is 15 h 07 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 10528 change?

Yes. The 2012 USDA map put 10528 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.