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

Planting zone for 41271 — Williamsport, KY

ZIP code 41271 (Williamsport, Johnson County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 19 and the first fall frost October 25.

Where ZIP 41271 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.

Zone7a0 to 5 °F
Coldest night−17.8 to −15 °C
Last frostApr 19
First frostOct 25
2012 zone6b

Was 6b 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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Williamsport, KY…

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 Williamsport, KY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 19median — 50% chance of a later frost
Safe for tender plantsMay 6only 10% chance of frost after
First fall frostOctober 25median — 10% chance by Oct 11
Growing season188 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 5 and returns around November 2.

From the NOAA station Paintsville 1e, KY — 4 miles away, elevation 630 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 41271

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 8 – Mar 22
SpinachSow outdoors · Mar 8 – Mar 29
Broccoli, cabbageStart indoors · Feb 8 – Feb 22
Broccoli, cabbageTransplant · Mar 29 – Apr 12
Onion setsPlant outdoors · Mar 22 – Apr 5
PotatoesPlant outdoors · Mar 29 – Apr 12
LettuceSow outdoors · Mar 22 – Apr 5
Carrots, beetsSow outdoors · Mar 29 – Apr 12
TomatoesStart indoors · Feb 22 – Mar 8
TomatoesTransplant · Apr 26 – May 10
Peppers, eggplantStart indoors · Feb 8 – Feb 22
Peppers, eggplantTransplant · May 3 – May 17
BeansSow outdoors · Apr 26 – May 10
Sweet cornSow outdoors · Apr 26 – May 10
Cucumbers, squashSow outdoors · Apr 26 – May 10
Fall lettuce, spinachSow outdoors · Aug 30 – Sep 13
GarlicPlant cloves · Oct 11 – Nov 15
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 19) and first fall frost (Oct 25) 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 41271 came on Mar 5 — 3 days earlier than the 1991–2020 average (Mar 8).

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 Williamsport, KY

The soil mapped at the center of ZIP 41271 is Matewan — very channery moderately decomposed plant material, well drained.

TextureVery channery moderately decomposed plant materialtop layer
pH4.3strongly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter69.7%high
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Matewan-Gilpin-Marrowbone complex, 12 to 80 percent slopes, very rocky.

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 41271; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Williamsport, KY

Summer high86 °Faverage high, July
Winter low23 °Faverage low, January
Hot days25days a year at 90 °F or more
Freezing nights110nights a year at 32 °F or less
Growing degree days3,772base 50 °F — the season’s usable heat
Longest day14 h 47 mindaylight on June 21
Shortest day9 h 32 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation46.2 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 44 °F, low 23 °F 44°23° JanFebruary: average high 49 °F, low 26 °F 49°26° FebMarch: average high 58 °F, low 32 °F 58°32° MarApril: average high 70 °F, low 41 °F 70°41° AprMay: average high 76 °F, low 51 °F 76°51° MayJune: average high 83 °F, low 60 °F 83°60° JunJuly: average high 86 °F, low 65 °F 86°65° JulAugust: average high 86 °F, low 63 °F 86°63° AugSeptember: average high 80 °F, low 56 °F 80°56° SepOctober: average high 70 °F, low 43 °F 70°43° OctNovember: average high 58 °F, low 32 °F 58°32° NovDecember: average high 48 °F, low 28 °F 48°28° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 3.35 in precipitation 3.4 JanFebruary: 3.21 in precipitation 3.2 FebMarch: 4.41 in precipitation 4.4 MarApril: 3.82 in precipitation 3.8 AprMay: 4.43 in precipitation 4.4 MayJune: 4.79 in precipitation 4.8 JunJuly: 5.18 in precipitation 5.2 JulAugust: 3.63 in precipitation 3.6 AugSeptember: 3.35 in precipitation 3.4 SepOctober: 3.19 in precipitation 3.2 OctNovember: 3.00 in precipitation 3.0 NovDecember: 3.83 in precipitation 3.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Paintsville 1e, KY (4 mi away); precipitation: Paintsville 1e, KY (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

412607a
Thelma, KY · 2 mi
412347a
Meally, KY · 2 mi
412637a
Tutor Key, KY · 3 mi
412047a
Boons Camp, KY · 3 mi
412407a
Paintsville, KY · 3 mi
412547a
River, KY · 4 mi
412687a
West Van Lear, KY · 4 mi
412657a
Van Lear, KY · 5 mi

Kentucky planting zones →

Questions about 41271

What planting zone is ZIP code 41271?

ZIP code 41271 (Williamsport, KY) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Williamsport, KY?

The median last spring frost (32 °F) near 41271 is April 19; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Paintsville 1e station.

When is the first frost in Williamsport, KY?

The median first fall frost near 41271 is October 25, giving a median frost-free growing season of 188 days.

When should I plant tomatoes in 41271?

Start tomato seeds indoors around Feb 22 – Mar 8 and set transplants outside around Apr 26 – May 10, one to three weeks after the median last frost.

How much rain and snow does 41271 get?

About 46.2 inches of precipitation a year (NOAA 1991–2020 normals, Paintsville 1e station).

How hot do summers get in Williamsport, KY?

The average high peaks at 86 °F in July, with about 25 days a year at 90 °F or more.

What kind of soil does 41271 have?

The USDA soil survey maps Matewan at the center of ZIP 41271: very channery moderately decomposed plant material, well drained, pH about 4.3 (strongly acidic).

Did spring come early in Williamsport, KY in 2026?

Spring leaf-out near 41271 came on Mar 5 in 2026, 3 days earlier than the 1991–2020 average (Mar 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Williamsport, KY?

Intermediate onions: the longest day near 41271 is 14 h 47 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 41271 change?

Yes. The 2012 USDA map put 41271 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.