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

Planting zone for 41149 — Isonville, KY

ZIP code 41149 (Isonville, Elliott County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 10 and the first fall frost October 31.

Where ZIP 41149 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 10

First frostOct 31

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 Isonville, 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 Isonville, KY

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 10median — 50% chance of a later frost

Safe for tender plantsMay 2only 10% chance of frost after

First fall frostOctober 31median — 10% chance by Oct 17

Growing season201 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around November 10.

From the NOAA station Gimlet 9n, KY — 9 miles away, elevation 1,119 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 41149

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 27 – Mar 13

SpinachSow outdoors · Feb 27 – Mar 20

Broccoli, cabbageStart indoors · Jan 30 – Feb 13

Broccoli, cabbageTransplant · Mar 20 – Apr 3

Onion setsPlant outdoors · Mar 13 – Mar 27

PotatoesPlant outdoors · Mar 20 – Apr 3

LettuceSow outdoors · Mar 13 – Mar 27

Carrots, beetsSow outdoors · Mar 20 – Apr 3

TomatoesStart indoors · Feb 13 – Feb 27

TomatoesTransplant · Apr 17 – May 1

Peppers, eggplantStart indoors · Jan 30 – Feb 13

Peppers, eggplantTransplant · Apr 24 – May 8

BeansSow outdoors · Apr 17 – May 1

Sweet cornSow outdoors · Apr 17 – May 1

Cucumbers, squashSow outdoors · Apr 17 – May 1

Fall lettuce, spinachSow outdoors · Sep 5 – Sep 19

GarlicPlant cloves · Oct 17 – Nov 21

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 10) and first fall frost (Oct 31) 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 41149 came on Mar 8 — 8 days earlier than the 1991–2020 average (Mar 16).

average
Mar 162026
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).

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 Isonville, KY.

Soil in Isonville, KY

The soil mapped at the center of ZIP 41149 is Blairton — highly decomposed plant material, moderately well drained.

TextureHighly decomposed plant materialtop layer

pH4.1strongly acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter52%high

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classNot prime farmlandUSDA classification

Map unit: Blairton-Cruze-Marrowbone complex, 12 to 25 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 41149; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Isonville, KY

Summer high87 °Faverage high, July

Winter low23 °Faverage low, January

Hot days25days a year at 90 °F or more

Freezing nights98nights a year at 32 °F or less

Growing degree days3,840base 50 °F — the season’s usable heat

Longest day14 h 49 mindaylight on June 21

Shortest day9 h 31 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation47.8 inper year, rain and melted snow

Snowfall3 inper year; 2 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Gimlet 9n, KY (9 mi away); precipitation: Grayson Lake, KY (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

411716b

Sandy Hook, KY · 7 mi

Webbville, KY · 11 mi

403176b

Elliottville, KY · 12 mi

411426b

Grahn, KY · 12 mi

Kentucky planting zones →

Questions about 41149

What planting zone is ZIP code 41149?

ZIP code 41149 (Isonville, 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 Isonville, KY?

The median last spring frost (32 °F) near 41149 is April 10; after May 2 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Gimlet 9n station.

When is the first frost in Isonville, KY?

The median first fall frost near 41149 is October 31, giving a median frost-free growing season of 201 days.

When should I plant tomatoes in 41149?

Start tomato seeds indoors around Feb 13 – Feb 27 and set transplants outside around Apr 17 – May 1, one to three weeks after the median last frost.

How much rain and snow does 41149 get?

About 47.8 inches of precipitation a year and 3 inches of snowfall (NOAA 1991–2020 normals, Grayson Lake station).

How hot do summers get in Isonville, KY?

The average high peaks at 87 °F in July, with about 25 days a year at 90 °F or more.

What kind of soil does 41149 have?

The USDA soil survey maps Blairton at the center of ZIP 41149: highly decomposed plant material, moderately well drained, pH about 4.1 (strongly acidic).

Did spring come early in Isonville, KY in 2026?

Spring leaf-out near 41149 came on Mar 8 in 2026, 8 days earlier than the 1991–2020 average (Mar 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Isonville, KY?

Intermediate onions: the longest day near 41149 is 14 h 49 min, so day-neutral types bulb best; long-day varieties may not bulb fully.