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

Planting zone for 40358 — Olympia, KY

ZIP code 40358 (Olympia, Bath County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 17 and the first fall frost October 25.

Where ZIP 40358 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 17
First frostOct 25
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 Olympia, 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 Olympia, KY

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 17median — 50% chance of a later frost
Safe for tender plantsMay 6only 10% chance of frost after
First fall frostOctober 25median — 10% chance by Oct 13
Growing season189 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 3 and returns around November 4.

From the NOAA station Cave Run Lake, KY — 9 miles away, elevation 840 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 40358

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 6 – Mar 20
SpinachSow outdoors · Mar 6 – Mar 27
Broccoli, cabbageStart indoors · Feb 6 – Feb 20
Broccoli, cabbageTransplant · Mar 27 – Apr 10
Onion setsPlant outdoors · Mar 20 – Apr 3
PotatoesPlant outdoors · Mar 27 – Apr 10
LettuceSow outdoors · Mar 20 – Apr 3
Carrots, beetsSow outdoors · Mar 27 – Apr 10
TomatoesStart indoors · Feb 20 – Mar 6
TomatoesTransplant · Apr 24 – May 8
Peppers, eggplantStart indoors · Feb 6 – Feb 20
Peppers, eggplantTransplant · May 1 – May 15
BeansSow outdoors · Apr 24 – May 8
Sweet cornSow outdoors · Apr 24 – May 8
Cucumbers, squashSow outdoors · Apr 24 – May 8
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 17) 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 40358 came on Mar 7 — 4 days earlier than the 1991–2020 average (Mar 11).

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 Olympia, KY

The soil mapped at the center of ZIP 40358 is Orrville — loam, somewhat poorly drained.

TextureLoama good balance for most vegetables
pH7.0neutral; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter3%moderate
Hydrologic groupB/Dmoderate when drained; wet otherwise
Farmland classPrime farmland if drained and either protected from flooding or not frequently flooded during the growing seasonUSDA classification

Map unit: Orrville loam, 0 to 3 percent slopes, frequently 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 40358; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Olympia, KY

Summer high86 °Faverage high, July
Winter low25 °Faverage low, January
Hot days31days a year at 90 °F or more
Freezing nights101nights a year at 32 °F or less
Growing degree days3,721base 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
Precipitation52.4 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 41 °F, low 25 °F 41°25° JanFebruary: average high 46 °F, low 27 °F 46°27° FebMarch: average high 55 °F, low 33 °F 55°33° MarApril: average high 67 °F, low 42 °F 67°42° AprMay: average high 75 °F, low 52 °F 75°52° MayJune: average high 82 °F, low 61 °F 82°61° JunJuly: average high 86 °F, low 65 °F 86°65° JulAugust: average high 85 °F, low 63 °F 85°63° AugSeptember: average high 79 °F, low 56 °F 79°56° SepOctober: average high 68 °F, low 45 °F 68°45° OctNovember: average high 56 °F, low 35 °F 56°35° NovDecember: average high 45 °F, low 29 °F 45°29° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.87 in precipitation 3.9 JanFebruary: 4.20 in precipitation 4.2 FebMarch: 4.90 in precipitation 4.9 MarApril: 4.73 in precipitation 4.7 AprMay: 4.97 in precipitation 5.0 MayJune: 4.75 in precipitation 4.8 JunJuly: 4.98 in precipitation 5.0 JulAugust: 3.82 in precipitation 3.8 AugSeptember: 4.04 in precipitation 4.0 SepOctober: 3.91 in precipitation 3.9 OctNovember: 3.54 in precipitation 3.5 NovDecember: 4.72 in precipitation 4.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Cave Run Lake, KY (9 mi away); precipitation: Frenchburg 2 W, KY (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

403346b
Hope, KY · 4 mi
403716b
Salt Lick, KY · 5 mi
403467a
Means, KY · 6 mi
403606b
Owingsville, KY · 9 mi
403227a
Frenchburg, KY · 9 mi
403196b
Farmers, KY · 10 mi
403167a
Denniston, KY · 12 mi
403376b
Jeffersonville, KY · 12 mi

Kentucky planting zones →

Questions about 40358

What planting zone is ZIP code 40358?

ZIP code 40358 (Olympia, 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 Olympia, KY?

The median last spring frost (32 °F) near 40358 is April 17; after May 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Cave Run Lake station.

When is the first frost in Olympia, KY?

The median first fall frost near 40358 is October 25, giving a median frost-free growing season of 189 days.

When should I plant tomatoes in 40358?

Start tomato seeds indoors around Feb 20 – Mar 6 and set transplants outside around Apr 24 – May 8, one to three weeks after the median last frost.

How much rain and snow does 40358 get?

About 52.4 inches of precipitation a year (NOAA 1991–2020 normals, Frenchburg 2 W station).

How hot do summers get in Olympia, KY?

The average high peaks at 86 °F in July, with about 31 days a year at 90 °F or more.

What kind of soil does 40358 have?

The USDA soil survey maps Orrville at the center of ZIP 40358: loam, somewhat poorly drained, pH about 7.0 (neutral).

Did spring come early in Olympia, KY in 2026?

Spring leaf-out near 40358 came on Mar 7 in 2026, 4 days earlier than the 1991–2020 average (Mar 11), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Olympia, KY?

Intermediate onions: the longest day near 40358 is 14 h 49 min, so day-neutral types bulb best; long-day varieties may not bulb fully.