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

Planting zone for 13302 — Altmar, NY

ZIP code 13302 (Altmar, Oswego County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 10 and the first fall frost October 14.

Where ZIP 13302 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 10
First frostOct 14
2012 zone5a

Was 5a 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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Altmar, 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 Altmar, NY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 10median — 50% chance of a later frost
Safe for tender plantsMay 26only 10% chance of frost after
First fall frostOctober 14median — 10% chance by Sep 29
Growing season156 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 28 and returns around November 1.

From the NOAA station Pulaski, NY — 9 miles away, elevation 400 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 13302

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 29 – Apr 12
SpinachSow outdoors · Mar 29 – Apr 19
Broccoli, cabbageStart indoors · Mar 1 – Mar 15
Broccoli, cabbageTransplant · Apr 19 – May 3
Onion setsPlant outdoors · Apr 12 – Apr 26
PotatoesPlant outdoors · Apr 19 – May 3
LettuceSow outdoors · Apr 12 – Apr 26
Carrots, beetsSow outdoors · Apr 19 – May 3
TomatoesStart indoors · Mar 15 – Mar 29
TomatoesTransplant · May 17 – May 31
Peppers, eggplantStart indoors · Mar 1 – Mar 15
Peppers, eggplantTransplant · May 24 – Jun 7
BeansSow outdoors · May 17 – May 31
Sweet cornSow outdoors · May 17 – May 31
Cucumbers, squashSow outdoors · May 17 – May 31
Fall lettuce, spinachSow outdoors · Aug 19 – Sep 2
GarlicPlant cloves · Sep 30 – Nov 4
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 10) and first fall frost (Oct 14) 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 13302 came on Apr 13 — 4 days earlier than the 1991–2020 average (Apr 17).

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).

Soil in Altmar, NY

The soil mapped at the center of ZIP 13302 is Colton — gravelly loamy sand, excessively drained.

TextureGravelly loamy sanddrains and warms fast; dries out and needs more feeding
pH4.8strongly acidic; most vegetables like 6.0–7.0
DrainageExcessively drainednatural drainage class
Organic matter5.5%high
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Colton-Hinckley complex, moderately steep.

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 13302; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Altmar, NY

Summer high79 °Faverage high, July
Winter low11 °Faverage low, January
Hot days3days a year at 90 °F or more
Freezing nights158nights a year at 32 °F or less
Growing degree days2,039base 50 °F — the season’s usable heat
Longest day15 h 25 mindaylight on June 21
Shortest day8 h 57 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation52.8 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 29 °F, low 11 °F 29°11° JanFebruary: average high 31 °F, low 13 °F 31°13° FebMarch: average high 39 °F, low 20 °F 39°20° MarApril: average high 51 °F, low 32 °F 51°32° AprMay: average high 65 °F, low 42 °F 65°42° MayJune: average high 73 °F, low 52 °F 73°52° JunJuly: average high 79 °F, low 57 °F 79°57° JulAugust: average high 77 °F, low 56 °F 77°56° AugSeptember: average high 71 °F, low 48 °F 71°48° SepOctober: average high 58 °F, low 40 °F 58°40° OctNovember: average high 46 °F, low 30 °F 46°30° NovDecember: average high 34 °F, low 19 °F 34°19° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 4.19 in precipitation 4.2 JanFebruary: 4.15 in precipitation 4.2 FebMarch: 3.56 in precipitation 3.6 MarApril: 3.89 in precipitation 3.9 AprMay: 4.06 in precipitation 4.1 MayJune: 4.35 in precipitation 4.3 JunJuly: 3.97 in precipitation 4.0 JulAugust: 3.99 in precipitation 4.0 AugSeptember: 4.33 in precipitation 4.3 SepOctober: 5.51 in precipitation 5.5 OctNovember: 5.10 in precipitation 5.1 NovDecember: 5.69 in precipitation 5.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Pulaski, NY (9 mi away); precipitation: Bennetts Brg, NY (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

131445a
Richland, NY · 5 mi
134935a
Williamstown, NY · 6 mi
131315b
Parish, NY · 8 mi
131425b
Pulaski, NY · 10 mi
131075b
Maple View, NY · 10 mi
134835a
Westdale, NY · 10 mi
134374b
Redfield, NY · 10 mi
130835a
Lacona, NY · 10 mi

New York planting zones →

Questions about 13302

What planting zone is ZIP code 13302?

ZIP code 13302 (Altmar, NY) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Altmar, NY?

The median last spring frost (32 °F) near 13302 is May 10; after May 26 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Pulaski station.

When is the first frost in Altmar, NY?

The median first fall frost near 13302 is October 14, giving a median frost-free growing season of 156 days.

When should I plant tomatoes in 13302?

Start tomato seeds indoors around Mar 15 – Mar 29 and set transplants outside around May 17 – May 31, one to three weeks after the median last frost.

How much rain and snow does 13302 get?

About 52.8 inches of precipitation a year (NOAA 1991–2020 normals, Bennetts Brg station).

How hot do summers get in Altmar, NY?

The average high peaks at 79 °F in July, with about 3 days a year at 90 °F or more.

What kind of soil does 13302 have?

The USDA soil survey maps Colton at the center of ZIP 13302: gravelly loamy sand, excessively drained, pH about 4.8 (strongly acidic).

Did spring come early in Altmar, NY in 2026?

Spring leaf-out near 13302 came on Apr 13 in 2026, 4 days earlier than the 1991–2020 average (Apr 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Altmar, NY?

Long-day onions: the longest day near 13302 is 15 h 25 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 13302 change?

Yes. The 2012 USDA map put 13302 in zone 5a; the 2023 map puts it in zone 5b. The newer map uses 1991–2020 data and more weather stations.