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

Planting zone for Plattsburgh, NY

Plattsburgh, NY is in USDA zone 5a across its 2 ZIP codes. The median last spring frost is May 6 and the first fall frost October 5.

Plattsburgh on the zone map

Outlined: its 2 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.

Zone5a−20 to −15 °F
ZIP codes2
Last frostMay 6
First frostOct 5
Growing season152 days

5a 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 Plattsburgh, NY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 6median — 50% chance of a later frost
Safe for tender plantsMay 19only 10% chance of frost after
First fall frostOctober 5median — 10% chance by Sep 23
Growing season152 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 25 and returns around October 19.

From the NOAA station Plattsburgh Intl Airport, NY, elevation 233 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 Plattsburgh

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 25 – Apr 8
SpinachSow outdoors · Mar 25 – Apr 15
Broccoli, cabbageStart indoors · Feb 25 – Mar 11
Broccoli, cabbageTransplant · Apr 15 – Apr 29
Onion setsPlant outdoors · Apr 8 – Apr 22
PotatoesPlant outdoors · Apr 15 – Apr 29
LettuceSow outdoors · Apr 8 – Apr 22
Carrots, beetsSow outdoors · Apr 15 – Apr 29
TomatoesStart indoors · Mar 11 – Mar 25
TomatoesTransplant · May 13 – May 27
Peppers, eggplantStart indoors · Feb 25 – Mar 11
Peppers, eggplantTransplant · May 20 – Jun 3
BeansSow outdoors · May 13 – May 27
Sweet cornSow outdoors · May 13 – May 27
Cucumbers, squashSow outdoors · May 13 – May 27
Fall lettuce, spinachSow outdoors · Aug 10 – Aug 24
GarlicPlant cloves · Sep 21 – Oct 26
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 6) and first fall frost (Oct 5) 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 12901 came on Apr 16 — about the same time as the 1991–2020 average (Apr 18).

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 5a in New York

584 plants native to the lower 48 states, recorded in New York, and rated by the USDA to survive −20 °F or colder — the bottom of zone 5a. Each links to its USDA PLANTS profile.

Trees 68

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 116

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 201

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 179

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 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 7

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °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 °Ftrumpet honeysuckle16 ft · blooms late summer · low shade tolerance · to −33 °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 Plattsburgh, NY.

Soil in Plattsburgh, NY

The soil mapped at the center of ZIP 12901 is Udorthents — loam, well drained.

TextureLoama good balance for most vegetables
pH5.6moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.5%moderate
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Udorthents, smoothed.

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 12901; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Plattsburgh, NY

Summer high81 °Faverage high, July
Winter low10 °Faverage low, January
Hot days7days a year at 90 °F or more
Freezing nights154nights a year at 32 °F or less
Growing degree days2,230base 50 °F — the season’s usable heat
Longest day15 h 35 mindaylight on June 21
Shortest day8 h 48 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation36 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 28 °F, low 10 °F 28°10° JanFebruary: average high 31 °F, low 11 °F 31°11° FebMarch: average high 40 °F, low 21 °F 40°21° MarApril: average high 54 °F, low 33 °F 54°33° AprMay: average high 68 °F, low 44 °F 68°44° MayJune: average high 75 °F, low 53 °F 75°53° JunJuly: average high 81 °F, low 59 °F 81°59° JulAugust: average high 79 °F, low 57 °F 79°57° AugSeptember: average high 71 °F, low 49 °F 71°49° SepOctober: average high 58 °F, low 38 °F 58°38° OctNovember: average high 46 °F, low 29 °F 46°29° NovDecember: average high 34 °F, low 19 °F 34°19° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 1.81 in precipitation 1.8 JanFebruary: 2.24 in precipitation 2.2 FebMarch: 2.37 in precipitation 2.4 MarApril: 2.81 in precipitation 2.8 AprMay: 3.00 in precipitation 3.0 MayJune: 4.12 in precipitation 4.1 JunJuly: 3.74 in precipitation 3.7 JulAugust: 3.70 in precipitation 3.7 AugSeptember: 3.34 in precipitation 3.3 SepOctober: 3.35 in precipitation 3.4 OctNovember: 2.83 in precipitation 2.8 NovDecember: 2.69 in precipitation 2.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Plattsburgh Intl Airport, NY (4 mi away); precipitation: Plattsburgh 1 S, NY (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Plattsburgh

129015a
−20 to −15 °F
129035a
−20 to −15 °F

New York planting zones →

Questions about Plattsburgh

What planting zone is Plattsburgh, NY?

Plattsburgh, NY is in USDA hardiness zone 5a on the 2023 map (5a: −20 to −15 °F).

When is the last frost in Plattsburgh, NY?

The median last spring frost is May 6 and the median first fall frost is October 5 (NOAA 1991–2020 normals, Plattsburgh Intl Airport station).

When can I plant a garden in Plattsburgh, NY?

Cool-season crops like peas and spinach go in around Mar 25 – Apr 15; tomatoes, peppers, beans and squash after about May 13, once frost risk has passed.

What kind of onions grow in Plattsburgh, NY?

Long-day onions: the longest day is 15 h 35 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Plattsburgh, NY get?

About 36 inches of precipitation a year (NOAA 1991–2020 normals).