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

Planting zone for 40391 — Winchester, KY

ZIP code 40391 (Winchester, Clark County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 20 and the first fall frost October 19.

Where ZIP 40391 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 20

First frostOct 19

2012 zone6b

Same zone as on the 2012 map. 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 Winchester, 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 Winchester, KY

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 20median — 50% chance of a later frost

Safe for tender plantsMay 8only 10% chance of frost after

First fall frostOctober 19median — 10% chance by Oct 8

Growing season182 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 7 and returns around October 30.

From the NOAA station Cressy, KY — 11 miles away, elevation 722 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 40391

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 9 – Mar 23

SpinachSow outdoors · Mar 9 – Mar 30

Broccoli, cabbageStart indoors · Feb 9 – Feb 23

Broccoli, cabbageTransplant · Mar 30 – Apr 13

Onion setsPlant outdoors · Mar 23 – Apr 6

PotatoesPlant outdoors · Mar 30 – Apr 13

LettuceSow outdoors · Mar 23 – Apr 6

Carrots, beetsSow outdoors · Mar 30 – Apr 13

TomatoesStart indoors · Feb 23 – Mar 9

TomatoesTransplant · Apr 27 – May 11

Peppers, eggplantStart indoors · Feb 9 – Feb 23

Peppers, eggplantTransplant · May 4 – May 18

BeansSow outdoors · Apr 27 – May 11

Sweet cornSow outdoors · Apr 27 – May 11

Cucumbers, squashSow outdoors · Apr 27 – May 11

Fall lettuce, spinachSow outdoors · Aug 24 – Sep 7

GarlicPlant cloves · Oct 5 – Nov 9

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 20) and first fall frost (Oct 19) 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 40391 came on Mar 6 — 4 days earlier than the 1991–2020 average (Mar 10).

average
Mar 102026
Mar 6

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 6b in Kentucky

531 plants native to the lower 48 states, recorded in Kentucky, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. 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 Winchester, KY.

Soil in Winchester, KY

The soil mapped at the center of ZIP 40391 is Lindside — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables

pH6.5neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter2.5%moderate

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Lindside silt loam, 0 to 2 percent slopes, occasionally flooded.

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 40391; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Winchester, KY

Summer high85 °Faverage high, July

Winter low23 °Faverage low, January

Hot days18days a year at 90 °F or more

Freezing nights116nights a year at 32 °F or less

Growing degree days3,664base 50 °F — the season’s usable heat

Longest day14 h 48 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

Precipitation49.3 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: Cressy, KY (11 mi away); precipitation: Mount Sterling 2.4 W, KY (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

403927a

Winchester, KY · 2 mi

403576b

North Middletown, KY · 12 mi

403536b

Mount Sterling, KY · 13 mi

405097a

Lexington, KY · 13 mi

405167a

Lexington, KY · 14 mi

403126b

Clay City, KY · 14 mi

405157a

Lexington, KY · 15 mi

403376b

Jeffersonville, KY · 16 mi

All 2 ZIP codes in Winchester → · Kentucky planting zones →

Questions about 40391

What planting zone is ZIP code 40391?

ZIP code 40391 (Winchester, KY) 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 Winchester, KY?

The median last spring frost (32 °F) near 40391 is April 20; after May 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cressy station.

When is the first frost in Winchester, KY?

The median first fall frost near 40391 is October 19, giving a median frost-free growing season of 182 days.

When should I plant tomatoes in 40391?

Start tomato seeds indoors around Feb 23 – Mar 9 and set transplants outside around Apr 27 – May 11, one to three weeks after the median last frost.

How much rain and snow does 40391 get?

About 49.3 inches of precipitation a year (NOAA 1991–2020 normals, Mount Sterling 2.4 W station).

How hot do summers get in Winchester, KY?

The average high peaks at 85 °F in July, with about 18 days a year at 90 °F or more.

What kind of soil does 40391 have?

The USDA soil survey maps Lindside at the center of ZIP 40391: silt loam, moderately well drained, pH about 6.5 (neutral).

Did spring come early in Winchester, KY in 2026?

Spring leaf-out near 40391 came on Mar 6 in 2026, 4 days earlier than the 1991–2020 average (Mar 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Winchester, KY?

Intermediate onions: the longest day near 40391 is 14 h 48 min, so day-neutral types bulb best; long-day varieties may not bulb fully.