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

Planting zone for 43902 — Alledonia, OH

ZIP code 43902 (Alledonia, Belmont County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 26 and the first fall frost October 21.

Where ZIP 43902 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.

Zone6b−5 to 0 °F
Coldest night−20.6 to −17.8 °C
Last frostApr 26
First frostOct 21
2012 zone6a

Was 6a 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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Alledonia, OH…

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 Alledonia, OH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 26median — 50% chance of a later frost
Safe for tender plantsMay 12only 10% chance of frost after
First fall frostOctober 21median — 10% chance by Oct 8
Growing season177 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 15 and returns around November 1.

From the NOAA station Moundsville, WV — 11 miles away, elevation 620 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 43902

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 15 – Mar 29
SpinachSow outdoors · Mar 15 – Apr 5
Broccoli, cabbageStart indoors · Feb 15 – Mar 1
Broccoli, cabbageTransplant · Apr 5 – Apr 19
Onion setsPlant outdoors · Mar 29 – Apr 12
PotatoesPlant outdoors · Apr 5 – Apr 19
LettuceSow outdoors · Mar 29 – Apr 12
Carrots, beetsSow outdoors · Apr 5 – Apr 19
TomatoesStart indoors · Mar 1 – Mar 15
TomatoesTransplant · May 3 – May 17
Peppers, eggplantStart indoors · Feb 15 – Mar 1
Peppers, eggplantTransplant · May 10 – May 24
BeansSow outdoors · May 3 – May 17
Sweet cornSow outdoors · May 3 – May 17
Cucumbers, squashSow outdoors · May 3 – May 17
Fall lettuce, spinachSow outdoors · Aug 26 – Sep 9
GarlicPlant cloves · Oct 7 – Nov 11
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 26) and first fall frost (Oct 21) 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 43902 came on Mar 10 — 18 days earlier than the 1991–2020 average (Mar 28).

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 Alledonia, OH

The soil mapped at the center of ZIP 43902 is Lowell — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH5.5moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.5%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Lowell-Westmoreland silt loams, benched, 30 to 70 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 43902; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Alledonia, OH

Summer high86 °Faverage high, July
Winter low20 °Faverage low, January
Hot days22days a year at 90 °F or more
Freezing nights113nights a year at 32 °F or less
Growing degree days3,280base 50 °F — the season’s usable heat
Longest day15 h 00 mindaylight on June 21
Shortest day9 h 20 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation46.1 inper year, rain and melted snow
Snowfall16 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 39 °F, low 20 °F 39°20° JanFebruary: average high 43 °F, low 21 °F 43°21° FebMarch: average high 52 °F, low 29 °F 52°29° MarApril: average high 65 °F, low 38 °F 65°38° AprMay: average high 75 °F, low 49 °F 75°49° MayJune: average high 82 °F, low 58 °F 82°58° JunJuly: average high 86 °F, low 62 °F 86°62° JulAugust: average high 85 °F, low 61 °F 85°61° AugSeptember: average high 79 °F, low 53 °F 79°53° SepOctober: average high 67 °F, low 42 °F 67°42° OctNovember: average high 54 °F, low 31 °F 54°31° NovDecember: average high 44 °F, low 25 °F 44°25° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.77 in precipitation, 6 in snowfall 3.8❄6 JanFebruary: 3.13 in precipitation, 4.7 in snowfall 3.1❄5 FebMarch: 3.87 in precipitation, 2.4 in snowfall 3.9❄2 MarApril: 3.68 in precipitation, 0.1 in snowfall 3.7 AprMay: 4.47 in precipitation 4.5 MayJune: 4.89 in precipitation 4.9 JunJuly: 4.52 in precipitation 4.5 JulAugust: 3.82 in precipitation 3.8 AugSeptember: 3.88 in precipitation 3.9 SepOctober: 3.23 in precipitation 3.2 OctNovember: 3.15 in precipitation, 0.1 in snowfall 3.1 NovDecember: 3.72 in precipitation, 2.5 in snowfall 3.7❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Moundsville, WV (11 mi away); precipitation: Moundsville, WV (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

439336b
Jacobsburg, OH · 5 mi
437166b
Beallsville, OH · 5 mi
439426b
Powhatan Point, OH · 5 mi
439146b
Cameron, OH · 7 mi
437476b
Jerusalem, OH · 9 mi
437186b
Belmont, OH · 9 mi
439156b
Clarington, OH · 10 mi
439286b
Glencoe, OH · 10 mi

Ohio planting zones →

Questions about 43902

What planting zone is ZIP code 43902?

ZIP code 43902 (Alledonia, OH) is in USDA hardiness zone 6b on the 2023 map: the coldest night of an average winter reaches −5 to 0 °F (−20.6 to −17.8 °C).

When is the last frost in Alledonia, OH?

The median last spring frost (32 °F) near 43902 is April 26; after May 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Moundsville station.

When is the first frost in Alledonia, OH?

The median first fall frost near 43902 is October 21, giving a median frost-free growing season of 177 days.

When should I plant tomatoes in 43902?

Start tomato seeds indoors around Mar 1 – Mar 15 and set transplants outside around May 3 – May 17, one to three weeks after the median last frost.

How much rain and snow does 43902 get?

About 46.1 inches of precipitation a year and 16 inches of snowfall (NOAA 1991–2020 normals, Moundsville station).

How hot do summers get in Alledonia, OH?

The average high peaks at 86 °F in July, with about 22 days a year at 90 °F or more.

What kind of soil does 43902 have?

The USDA soil survey maps Lowell at the center of ZIP 43902: silt loam, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Alledonia, OH in 2026?

Spring leaf-out near 43902 came on Mar 10 in 2026, 18 days earlier than the 1991–2020 average (Mar 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Alledonia, OH?

Long-day onions: the longest day near 43902 is 15 h 00 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 43902 change?

Yes. The 2012 USDA map put 43902 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.