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

Planting zone for 10551 — Mount Vernon, NY

ZIP code 10551 (Mount Vernon, Westchester County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 1 and the first fall frost November 16.

Where ZIP 10551 is

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 1
First frostNov 16
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 Mount Vernon, 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 Mount Vernon, NY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 1median — 50% chance of a later frost
Safe for tender plantsApril 12only 10% chance of frost after
First fall frostNovember 16median — 10% chance by Nov 2
Growing season230 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 23 and returns around November 30.

From the NOAA station Bronx, NY — 5 miles away, elevation 39 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 10551

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 18 – Mar 4
SpinachSow outdoors · Feb 18 – Mar 11
Broccoli, cabbageStart indoors · Jan 21 – Feb 4
Broccoli, cabbageTransplant · Mar 11 – Mar 25
Onion setsPlant outdoors · Mar 4 – Mar 18
PotatoesPlant outdoors · Mar 11 – Mar 25
LettuceSow outdoors · Mar 4 – Mar 18
Carrots, beetsSow outdoors · Mar 11 – Mar 25
TomatoesStart indoors · Feb 4 – Feb 18
TomatoesTransplant · Apr 8 – Apr 22
Peppers, eggplantStart indoors · Jan 21 – Feb 4
Peppers, eggplantTransplant · Apr 15 – Apr 29
BeansSow outdoors · Apr 8 – Apr 22
Sweet cornSow outdoors · Apr 8 – Apr 22
Cucumbers, squashSow outdoors · Apr 8 – Apr 22
Fall lettuce, spinachSow outdoors · Sep 21 – Oct 5
GarlicPlant cloves · Nov 2 – Dec 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 1) and first fall frost (Nov 16) 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 10551 came on Mar 31 — 7 days later than the 1991–2020 average (Mar 24).

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.

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 224

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 201

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 Mount Vernon, NY.

Soil in Mount Vernon, NY

The soil mapped at the center of ZIP 10551 is Udorthents — gravelly loam, moderately well drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureGravelly loama good balance for most vegetables
pH5.9moderately acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter2.5%moderate
Farmland classNot prime farmlandUSDA classification

Map unit: Urban land.

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 10551; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mount Vernon, NY

Summer high86 °Faverage high, July
Winter low27 °Faverage low, January
Hot days23days a year at 90 °F or more
Freezing nights67nights a year at 32 °F or less
Growing degree days3,914base 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)
Precipitation49.9 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 40 °F, low 27 °F 40°27° JanFebruary: average high 43 °F, low 29 °F 43°29° FebMarch: average high 50 °F, low 35 °F 50°35° MarApril: average high 61 °F, low 44 °F 61°44° AprMay: average high 72 °F, low 55 °F 72°55° MayJune: average high 81 °F, low 64 °F 81°64° JunJuly: average high 86 °F, low 71 °F 86°71° JulAugust: average high 84 °F, low 69 °F 84°69° AugSeptember: average high 77 °F, low 62 °F 77°62° SepOctober: average high 66 °F, low 51 °F 66°51° OctNovember: average high 54 °F, low 41 °F 54°41° NovDecember: average high 45 °F, low 33 °F 45°33° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.74 in precipitation 3.7 JanFebruary: 3.19 in precipitation 3.2 FebMarch: 4.37 in precipitation 4.4 MarApril: 3.95 in precipitation 4.0 AprMay: 4.06 in precipitation 4.1 MayJune: 4.55 in precipitation 4.5 JunJuly: 4.37 in precipitation 4.4 JulAugust: 4.82 in precipitation 4.8 AugSeptember: 4.55 in precipitation 4.5 SepOctober: 4.13 in precipitation 4.1 OctNovember: 3.45 in precipitation 3.5 NovDecember: 4.67 in precipitation 4.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bronx, NY (5 mi away); precipitation: Bronx, NY (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

105507b
Mount Vernon, NY · <1 mi
105537b
Mount Vernon, NY · <1 mi
105527b
Mount Vernon, NY · <1 mi
107047b
Yonkers, NY · 1 mi
104667b
Bronx, NY · 2 mi
107087b
Bronxville, NY · 2 mi
108037b
Pelham, NY · 2 mi
104707b
Bronx, NY · 2 mi

All 4 ZIP codes in Mount Vernon → · New York planting zones →

Questions about 10551

What planting zone is ZIP code 10551?

ZIP code 10551 (Mount Vernon, 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 Mount Vernon, NY?

The median last spring frost (32 °F) near 10551 is April 1; after April 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bronx station.

When is the first frost in Mount Vernon, NY?

The median first fall frost near 10551 is November 16, giving a median frost-free growing season of 230 days.

When should I plant tomatoes in 10551?

Start tomato seeds indoors around Feb 4 – Feb 18 and set transplants outside around Apr 8 – Apr 22, one to three weeks after the median last frost.

How much rain and snow does 10551 get?

About 49.9 inches of precipitation a year (NOAA 1991–2020 normals, Bronx station).

How hot do summers get in Mount Vernon, NY?

The average high peaks at 86 °F in July, with about 23 days a year at 90 °F or more.

What kind of soil does 10551 have?

The USDA soil survey maps Udorthents at the center of ZIP 10551: gravelly loam, moderately well drained, pH about 5.9 (moderately acidic).

Did spring come early in Mount Vernon, NY in 2026?

Spring leaf-out near 10551 came on Mar 31 in 2026, 7 days later than the 1991–2020 average (Mar 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mount Vernon, NY?

Long-day onions: the longest day near 10551 is 15 h 07 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 10551 change?

Yes. The 2012 USDA map put 10551 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.