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

Planting zone for 45356 — Piqua, OH

ZIP code 45356 (Piqua, 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 45356 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 Piqua, 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 Piqua, 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 — 2 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 45356

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 45356 came on Mar 10 — 18 days earlier than the 1991–2020 average (Mar 28).

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 6a in Ohio

565 plants native to the lower 48 states, recorded in Ohio, and rated by the USDA to survive −10 °F or colder — the bottom of zone 6a. Each links to its USDA PLANTS profile.

Trees 70

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 202

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 vetch1.3 ft · blooms late spring · high shade tolerance · to −38 °F

Grasses 164

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °FBicknell's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 8

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °Ftrumpet creeper2 ft · blooms summer · high shade tolerance · to −13 °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 Piqua, OH.

Soil in Piqua, OH

The soil mapped at the center of ZIP 45356 is Miamian — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH6.5neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classprime farmlandUSDA classification

Map unit: Miamian silt loam, 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 45356; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Piqua, 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 02 mindaylight on June 21
Shortest day9 h 18 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation43.4 inper year, rain and melted snow
Snowfall15 inper year; 18 days with snow on the ground

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 · ❄ = snowfall

0″1″2″3″4″5″January: 3.38 in precipitation, 6.3 in snowfall 3.4❄6 JanFebruary: 2.49 in precipitation, 3.1 in snowfall 2.5❄3 FebMarch: 3.21 in precipitation, 2.2 in snowfall 3.2❄2 MarApril: 4.16 in precipitation, 0.4 in snowfall 4.2 AprMay: 4.33 in precipitation 4.3 MayJune: 4.61 in precipitation 4.6 JunJuly: 4.71 in precipitation 4.7 JulAugust: 3.93 in precipitation 3.9 AugSeptember: 3.14 in precipitation 3.1 SepOctober: 2.96 in precipitation, 0.1 in snowfall 3.0 OctNovember: 3.28 in precipitation, 0.5 in snowfall 3.3❄1 NovDecember: 3.16 in precipitation, 2.6 in snowfall 3.2❄3 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Piqua Wwtp, OH (2 mi away); precipitation: Piqua, OH (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

453186a
Covington, OH · 7 mi
453266a
Fletcher, OH · 7 mi
453336a
Houston, OH · 8 mi
453746a
Troy, OH · 8 mi
453656a
Sidney, OH · 9 mi
453736a
Troy, OH · 9 mi
453676a
Sidney, OH · 9 mi
453596a
Pleasant Hill, OH · 10 mi

Ohio planting zones →

Questions about 45356

What planting zone is ZIP code 45356?

ZIP code 45356 (Piqua, 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 Piqua, OH?

The median last spring frost (32 °F) near 45356 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 Piqua, OH?

The median first fall frost near 45356 is October 23, giving a median frost-free growing season of 186 days.

When should I plant tomatoes in 45356?

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 45356 get?

About 43.4 inches of precipitation a year and 15 inches of snowfall (NOAA 1991–2020 normals, Piqua station).

How hot do summers get in Piqua, 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 45356 have?

The USDA soil survey maps Miamian at the center of ZIP 45356: silt loam, well drained, pH about 6.5 (neutral).

Did spring come early in Piqua, OH in 2026?

Spring leaf-out near 45356 came on Mar 10 in 2026, 18 days earlier than the 1991–2020 average (Mar 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Piqua, OH?

Long-day onions: the longest day near 45356 is 15 h 02 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).