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

Planting zone for 45032 — Harveysburg, OH

ZIP code 45032 (Harveysburg, Warren County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 18 and the first fall frost October 24.

Where ZIP 45032 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 18
First frostOct 24
2012 zone6a

Was 6a 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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Harveysburg, OH…

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 Harveysburg, OH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 18median — 50% chance of a later frost
Safe for tender plantsMay 4only 10% chance of frost after
First fall frostOctober 24median — 10% chance by Oct 11
Growing season188 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 5 and returns around November 3.

From the NOAA station Xenia 6 Sse, OH — 9 miles away, elevation 997 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 45032

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 7 – Mar 21
SpinachSow outdoors · Mar 7 – Mar 28
Broccoli, cabbageStart indoors · Feb 7 – Feb 21
Broccoli, cabbageTransplant · Mar 28 – Apr 11
Onion setsPlant outdoors · Mar 21 – Apr 4
PotatoesPlant outdoors · Mar 28 – Apr 11
LettuceSow outdoors · Mar 21 – Apr 4
Carrots, beetsSow outdoors · Mar 28 – Apr 11
TomatoesStart indoors · Feb 21 – Mar 7
TomatoesTransplant · Apr 25 – May 9
Peppers, eggplantStart indoors · Feb 7 – Feb 21
Peppers, eggplantTransplant · May 2 – May 16
BeansSow outdoors · Apr 25 – May 9
Sweet cornSow outdoors · Apr 25 – May 9
Cucumbers, squashSow outdoors · Apr 25 – May 9
Fall lettuce, spinachSow outdoors · Aug 29 – Sep 12
GarlicPlant cloves · Oct 10 – Nov 14
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 18) and first fall frost (Oct 24) 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 45032 came on Mar 10 — 14 days earlier than the 1991–2020 average (Mar 24).

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 Harveysburg, OH

The soil mapped at the center of ZIP 45032 is Xenia — 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%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Xenia, Southern Ohio Till Plain-Urban land complex, 2 to 6 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 45032; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Harveysburg, OH

Summer high83 °Faverage high, July
Winter low23 °Faverage low, January
Hot days9days a year at 90 °F or more
Freezing nights104nights a year at 32 °F or less
Growing degree days3,573base 50 °F — the season’s usable heat
Longest day14 h 58 mindaylight on June 21
Shortest day9 h 22 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation44.5 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 38 °F, low 23 °F 38°23° JanFebruary: average high 42 °F, low 25 °F 42°25° FebMarch: average high 52 °F, low 34 °F 52°34° MarApril: average high 65 °F, low 44 °F 65°44° AprMay: average high 73 °F, low 54 °F 73°54° MayJune: average high 81 °F, low 62 °F 81°62° JunJuly: average high 83 °F, low 65 °F 83°65° JulAugust: average high 82 °F, low 63 °F 82°63° AugSeptember: average high 77 °F, low 56 °F 77°56° SepOctober: average high 66 °F, low 46 °F 66°46° OctNovember: average high 53 °F, low 36 °F 53°36° NovDecember: average high 42 °F, low 28 °F 42°28° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.18 in precipitation 3.2 JanFebruary: 2.86 in precipitation 2.9 FebMarch: 4.11 in precipitation 4.1 MarApril: 4.54 in precipitation 4.5 AprMay: 4.69 in precipitation 4.7 MayJune: 4.63 in precipitation 4.6 JunJuly: 4.34 in precipitation 4.3 JulAugust: 3.47 in precipitation 3.5 AugSeptember: 3.02 in precipitation 3.0 SepOctober: 3.07 in precipitation 3.1 OctNovember: 3.14 in precipitation 3.1 NovDecember: 3.41 in precipitation 3.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Xenia 6 Sse, OH (9 mi away); precipitation: Clarksville 2.3 Wnw, OH (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

450686b
Waynesville, OH · 3 mi
450546b
Oregonia, OH · 6 mi
451136b
Clarksville, OH · 7 mi
453706b
Spring Valley, OH · 7 mi
451776b
Wilmington, OH · 9 mi
453056b
Bellbrook, OH · 10 mi
454586b
Dayton, OH · 11 mi
450666b
Springboro, OH · 12 mi

Ohio planting zones →

Questions about 45032

What planting zone is ZIP code 45032?

ZIP code 45032 (Harveysburg, OH) 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 Harveysburg, OH?

The median last spring frost (32 °F) near 45032 is April 18; after May 4 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Xenia 6 Sse station.

When is the first frost in Harveysburg, OH?

The median first fall frost near 45032 is October 24, giving a median frost-free growing season of 188 days.

When should I plant tomatoes in 45032?

Start tomato seeds indoors around Feb 21 – Mar 7 and set transplants outside around Apr 25 – May 9, one to three weeks after the median last frost.

How much rain and snow does 45032 get?

About 44.5 inches of precipitation a year (NOAA 1991–2020 normals, Clarksville 2.3 Wnw station).

How hot do summers get in Harveysburg, OH?

The average high peaks at 83 °F in July, with about 9 days a year at 90 °F or more.

What kind of soil does 45032 have?

The USDA soil survey maps Xenia at the center of ZIP 45032: silt loam, moderately well drained, pH about 6.5 (neutral).

Did spring come early in Harveysburg, OH in 2026?

Spring leaf-out near 45032 came on Mar 10 in 2026, 14 days earlier than the 1991–2020 average (Mar 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Harveysburg, OH?

Intermediate onions: the longest day near 45032 is 14 h 58 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 45032 change?

Yes. The 2012 USDA map put 45032 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.