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

Planting zone for 13846 — Treadwell, NY

ZIP code 13846 (Treadwell, Delaware County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 17 and the first fall frost October 3.

Where ZIP 13846 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.

Zone5a−20 to −15 °F

Coldest night−28.9 to −26.1 °C

Last frostMay 17

First frostOct 3

2012 zone5b

Was 5b on the 2012 map — half a zone colder now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 5a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Treadwell, 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 Treadwell, NY

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 17median — 50% chance of a later frost

Safe for tender plantsMay 30only 10% chance of frost after

First fall frostOctober 3median — 10% chance by Sep 20

Growing season141 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 4 and returns around October 16.

From the NOAA station Emmons, NY — 7 miles away, elevation 1,224 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 13846

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 5 – Apr 19

SpinachSow outdoors · Apr 5 – Apr 26

Broccoli, cabbageStart indoors · Mar 8 – Mar 22

Broccoli, cabbageTransplant · Apr 26 – May 10

Onion setsPlant outdoors · Apr 19 – May 3

PotatoesPlant outdoors · Apr 26 – May 10

LettuceSow outdoors · Apr 19 – May 3

Carrots, beetsSow outdoors · Apr 26 – May 10

TomatoesStart indoors · Mar 22 – Apr 5

TomatoesTransplant · May 24 – Jun 7

Peppers, eggplantStart indoors · Mar 8 – Mar 22

Peppers, eggplantTransplant · May 31 – Jun 14

BeansSow outdoors · May 24 – Jun 7

Sweet cornSow outdoors · May 24 – Jun 7

Cucumbers, squashSow outdoors · May 24 – Jun 7

Fall lettuce, spinachSow outdoors · Aug 8 – Aug 22

GarlicPlant cloves · Sep 19 – Oct 24

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 17) and first fall frost (Oct 3) 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 13846 came on Apr 12 — 6 days earlier than the 1991–2020 average (Apr 18).

average
Apr 182026
Apr 12

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.

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 Treadwell, NY.

Soil in Treadwell, NY

The soil mapped at the center of ZIP 13846 is Onteora — channery silt loam, somewhat poorly drained.

TextureChannery silt loama good balance for most vegetables

pH5.5moderately acidic; most vegetables like 6.0–7.0

DrainageSomewhat poorly drainedconsider raised beds

Organic matter5%high

Hydrologic groupDwater soaks in very slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Onteora channery silt loam, 3 to 8 percent slopes.

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 13846; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Treadwell, NY

Summer high78 °Faverage high, July

Winter low11 °Faverage low, January

Hot days2days a year at 90 °F or more

Freezing nights167nights a year at 32 °F or less

Growing degree days1,963base 50 °F — the season’s usable heat

Longest day15 h 17 mindaylight on June 21

Shortest day9 h 04 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation47.8 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: Emmons, NY (7 mi away); precipitation: Delhi 6.6 Wnw, NY (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

West Davenport, NY · 9 mi

138255b

Otego, NY · 9 mi

137475b

Colliersville, NY · 9 mi

138595b

Wells Bridge, NY · 10 mi

New York planting zones →

Questions about 13846

What planting zone is ZIP code 13846?

ZIP code 13846 (Treadwell, NY) is in USDA hardiness zone 5a on the 2023 map: the coldest night of an average winter reaches −20 to −15 °F (−28.9 to −26.1 °C).

When is the last frost in Treadwell, NY?

The median last spring frost (32 °F) near 13846 is May 17; after May 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Emmons station.

When is the first frost in Treadwell, NY?

The median first fall frost near 13846 is October 3, giving a median frost-free growing season of 141 days.

When should I plant tomatoes in 13846?

Start tomato seeds indoors around Mar 22 – Apr 5 and set transplants outside around May 24 – Jun 7, one to three weeks after the median last frost.

How much rain and snow does 13846 get?

About 47.8 inches of precipitation a year (NOAA 1991–2020 normals, Delhi 6.6 Wnw station).

How hot do summers get in Treadwell, NY?

The average high peaks at 78 °F in July, with about 2 days a year at 90 °F or more.

What kind of soil does 13846 have?

The USDA soil survey maps Onteora at the center of ZIP 13846: channery silt loam, somewhat poorly drained, pH about 5.5 (moderately acidic).

Did spring come early in Treadwell, NY in 2026?

Spring leaf-out near 13846 came on Apr 12 in 2026, 6 days earlier than the 1991–2020 average (Apr 18), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Treadwell, NY?

Long-day onions: the longest day near 13846 is 15 h 17 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 13846 change?

Yes. The 2012 USDA map put 13846 in zone 5b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.