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

Planting zone for 40515 — Lexington, KY

ZIP code 40515 (Lexington, Fayette County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 15 and the first fall frost October 22.

Where ZIP 40515 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 15
First frostOct 22
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 Lexington, 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 Lexington, KY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 15median — 50% chance of a later frost
Safe for tender plantsApril 30only 10% chance of frost after
First fall frostOctober 22median — 10% chance by Oct 10
Growing season190 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 3 and returns around November 1.

From the NOAA station Eastern Kentucky Univ, KY — 12 miles away, elevation 1,001 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 40515

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 4 – Mar 18
SpinachSow outdoors · Mar 4 – Mar 25
Broccoli, cabbageStart indoors · Feb 4 – Feb 18
Broccoli, cabbageTransplant · Mar 25 – Apr 8
Onion setsPlant outdoors · Mar 18 – Apr 1
PotatoesPlant outdoors · Mar 25 – Apr 8
LettuceSow outdoors · Mar 18 – Apr 1
Carrots, beetsSow outdoors · Mar 25 – Apr 8
TomatoesStart indoors · Feb 18 – Mar 4
TomatoesTransplant · Apr 22 – May 6
Peppers, eggplantStart indoors · Feb 4 – Feb 18
Peppers, eggplantTransplant · Apr 29 – May 13
BeansSow outdoors · Apr 22 – May 6
Sweet cornSow outdoors · Apr 22 – May 6
Cucumbers, squashSow outdoors · Apr 22 – May 6
Fall lettuce, spinachSow outdoors · Aug 27 – Sep 10
GarlicPlant cloves · Oct 8 – Nov 12
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 15) and first fall frost (Oct 22) 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 40515 came on Mar 6 — 4 days earlier than the 1991–2020 average (Mar 10).

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 7a in Kentucky

547 plants native to the lower 48 states, recorded in Kentucky, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

Trees 78

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 109

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °F

Wildflowers & perennials 181

American bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °FAmerican spongeplant0.5 ft · blooms mid spring · high shade tolerance · to −24 °F

Grasses 153

autumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °FBailey's sedge2.1 ft · blooms late spring · low shade tolerance · to −33 °Fbig bluestem6 ft · blooms summer · high shade tolerance · to −46 °Fblister sedge3 ft · blooms late spring · medium shade tolerance · to −38 °Fbluejoint5 ft · blooms late spring · high shade tolerance · to −33 °F

Vines 14

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °F

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 Lexington, KY.

Soil in Lexington, KY

The soil mapped at the center of ZIP 40515 is Salvisa — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3.5%moderate
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Salvisa silty clay loam, 6 to 12 percent slopes, eroded.

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 40515; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Lexington, KY

Summer high87 °Faverage high, July
Winter low25 °Faverage low, January
Hot days26days a year at 90 °F or more
Freezing nights102nights a year at 32 °F or less
Growing degree days3,935base 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
Precipitation51.5 inper year, rain and melted snow
Snowfall10 inper year

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 42 °F, low 25 °F 42°25° JanFebruary: average high 48 °F, low 27 °F 48°27° FebMarch: average high 57 °F, low 34 °F 57°34° MarApril: average high 68 °F, low 43 °F 68°43° AprMay: average high 76 °F, low 54 °F 76°54° MayJune: average high 83 °F, low 62 °F 83°62° JunJuly: average high 87 °F, low 66 °F 87°66° JulAugust: average high 86 °F, low 65 °F 86°65° AugSeptember: average high 80 °F, low 57 °F 80°57° SepOctober: average high 69 °F, low 44 °F 69°44° OctNovember: average high 56 °F, low 36 °F 56°36° NovDecember: average high 46 °F, low 28 °F 46°28° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 3.71 in precipitation, 3.8 in snowfall 3.7❄4 JanFebruary: 3.93 in precipitation, 3.3 in snowfall 3.9❄3 FebMarch: 4.51 in precipitation, 1.3 in snowfall 4.5❄1 MarApril: 4.75 in precipitation 4.8 AprMay: 5.68 in precipitation 5.7 MayJune: 4.72 in precipitation 4.7 JunJuly: 5.32 in precipitation 5.3 JulAugust: 3.58 in precipitation 3.6 AugSeptember: 3.73 in precipitation 3.7 SepOctober: 3.68 in precipitation 3.7 OctNovember: 3.47 in precipitation, 0.2 in snowfall 3.5 NovDecember: 4.38 in precipitation, 1.6 in snowfall 4.4❄2 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Eastern Kentucky Univ, KY (12 mi away); precipitation: Keene 1 Wsw, KY (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

405097a
Lexington, KY · 6 mi
405177a
Lexington, KY · 6 mi
405027a
Lexington, KY · 8 mi
405127a
Lexington, KY · 8 mi
405227a
Lexington, KY · 8 mi
405237a
Lexington, KY · 8 mi
405247a
Lexington, KY · 8 mi
405337a
Lexington, KY · 8 mi

All 37 ZIP codes in Lexington → · Kentucky planting zones →

Questions about 40515

What planting zone is ZIP code 40515?

ZIP code 40515 (Lexington, 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 Lexington, KY?

The median last spring frost (32 °F) near 40515 is April 15; after April 30 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Eastern Kentucky Univ station.

When is the first frost in Lexington, KY?

The median first fall frost near 40515 is October 22, giving a median frost-free growing season of 190 days.

When should I plant tomatoes in 40515?

Start tomato seeds indoors around Feb 18 – Mar 4 and set transplants outside around Apr 22 – May 6, one to three weeks after the median last frost.

How much rain and snow does 40515 get?

About 51.5 inches of precipitation a year and 10 inches of snowfall (NOAA 1991–2020 normals, Keene 1 Wsw station).

How hot do summers get in Lexington, KY?

The average high peaks at 87 °F in July, with about 26 days a year at 90 °F or more.

What kind of soil does 40515 have?

The USDA soil survey maps Salvisa at the center of ZIP 40515: silty clay loam, well drained, pH about 7.0 (neutral).

Did spring come early in Lexington, KY in 2026?

Spring leaf-out near 40515 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 Lexington, KY?

Intermediate onions: the longest day near 40515 is 14 h 48 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 40515 change?

Yes. The 2012 USDA map put 40515 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.