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

Planting zone for 45359 — Pleasant Hill, OH

ZIP code 45359 (Pleasant Hill, Miami County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 18 and the first fall frost October 23.

Where ZIP 45359 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.

Zone6a−10 to −5 °F
Coldest night−23.3 to −20.6 °C
Last frostApr 18
First frostOct 23
2012 zone6a

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 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Pleasant Hill, 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 Pleasant Hill, 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 5only 10% chance of frost after
First fall frostOctober 23median — 10% chance by Oct 9
Growing season186 daysfrost-free, median

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

From the NOAA station Piqua Wwtp, OH — 8 miles away, elevation 853 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 45359

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 28 – Sep 11
GarlicPlant cloves · Oct 9 – Nov 13
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 18) and first fall frost (Oct 23) 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 45359 came on Mar 10 — 16 days earlier than the 1991–2020 average (Mar 26).

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 Pleasant Hill, OH

The soil mapped at the center of ZIP 45359 is Milton — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH6.3slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.25%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classFarmland of local importanceUSDA classification

Map unit: Milton silt loam, 6 to 12 percent slopes, moderately 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 45359; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Pleasant Hill, OH

Summer high84 °Faverage high, July
Winter low21 °Faverage low, January
Hot days17days a year at 90 °F or more
Freezing nights111nights a year at 32 °F or less
Growing degree days3,450base 50 °F — the season’s usable heat
Longest day15 h 01 mindaylight on June 21
Shortest day9 h 19 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation41 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 36 °F, low 21 °F 36°21° JanFebruary: average high 41 °F, low 23 °F 41°23° FebMarch: average high 51 °F, low 32 °F 51°32° MarApril: average high 64 °F, low 41 °F 64°41° AprMay: average high 74 °F, low 52 °F 74°52° MayJune: average high 81 °F, low 61 °F 81°61° JunJuly: average high 84 °F, low 65 °F 84°65° JulAugust: average high 83 °F, low 62 °F 83°62° AugSeptember: average high 78 °F, low 55 °F 78°55° SepOctober: average high 66 °F, low 44 °F 66°44° OctNovember: average high 52 °F, low 34 °F 52°34° NovDecember: average high 40 °F, low 25 °F 40°25° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.05 in precipitation 3.0 JanFebruary: 2.24 in precipitation 2.2 FebMarch: 3.16 in precipitation 3.2 MarApril: 4.04 in precipitation 4.0 AprMay: 4.22 in precipitation 4.2 MayJune: 4.35 in precipitation 4.3 JunJuly: 4.56 in precipitation 4.6 JulAugust: 3.32 in precipitation 3.3 AugSeptember: 3.09 in precipitation 3.1 SepOctober: 2.86 in precipitation 2.9 OctNovember: 3.05 in precipitation 3.0 NovDecember: 3.01 in precipitation 3.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Piqua Wwtp, OH (8 mi away); precipitation: Pleasant Hill, OH (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

453396a
Ludlow Falls, OH · 3 mi
453186a
Covington, OH · 5 mi
453376a
Laura, OH · 6 mi
453746a
Troy, OH · 6 mi
453836a
West Milton, OH · 6 mi
453616a
Potsdam, OH · 7 mi
453086a
Bradford, OH · 8 mi
453736a
Troy, OH · 8 mi

Ohio planting zones →

Questions about 45359

What planting zone is ZIP code 45359?

ZIP code 45359 (Pleasant Hill, OH) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Pleasant Hill, OH?

The median last spring frost (32 °F) near 45359 is April 18; after May 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Piqua Wwtp station.

When is the first frost in Pleasant Hill, OH?

The median first fall frost near 45359 is October 23, giving a median frost-free growing season of 186 days.

When should I plant tomatoes in 45359?

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 45359 get?

About 41 inches of precipitation a year (NOAA 1991–2020 normals, Pleasant Hill station).

How hot do summers get in Pleasant Hill, OH?

The average high peaks at 84 °F in July, with about 17 days a year at 90 °F or more.

What kind of soil does 45359 have?

The USDA soil survey maps Milton at the center of ZIP 45359: silt loam, well drained, pH about 6.3 (slightly acidic).

Did spring come early in Pleasant Hill, OH in 2026?

Spring leaf-out near 45359 came on Mar 10 in 2026, 16 days earlier than the 1991–2020 average (Mar 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Pleasant Hill, OH?

Long-day onions: the longest day near 45359 is 15 h 01 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).