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

Planting zone for 45415 — Dayton, OH

ZIP code 45415 (Dayton, Montgomery County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 16 and the first fall frost October 28.

Where ZIP 45415 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 16
First frostOct 28
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 Dayton, 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 Dayton, OH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 16median — 50% chance of a later frost
Safe for tender plantsMay 3only 10% chance of frost after
First fall frostOctober 28median — 10% chance by Oct 16
Growing season194 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around November 6.

From the NOAA station Dayton Intl Airport, OH — 6 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 45415

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 5 – Mar 19
SpinachSow outdoors · Mar 5 – Mar 26
Broccoli, cabbageStart indoors · Feb 5 – Feb 19
Broccoli, cabbageTransplant · Mar 26 – Apr 9
Onion setsPlant outdoors · Mar 19 – Apr 2
PotatoesPlant outdoors · Mar 26 – Apr 9
LettuceSow outdoors · Mar 19 – Apr 2
Carrots, beetsSow outdoors · Mar 26 – Apr 9
TomatoesStart indoors · Feb 19 – Mar 5
TomatoesTransplant · Apr 23 – May 7
Peppers, eggplantStart indoors · Feb 5 – Feb 19
Peppers, eggplantTransplant · Apr 30 – May 14
BeansSow outdoors · Apr 23 – May 7
Sweet cornSow outdoors · Apr 23 – May 7
Cucumbers, squashSow outdoors · Apr 23 – May 7
Fall lettuce, spinachSow outdoors · Sep 2 – Sep 16
GarlicPlant cloves · Oct 14 – Nov 18
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 16) and first fall frost (Oct 28) 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 45415 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).

Native plants for zone 6b in Ohio

570 plants native to the lower 48 states, recorded in Ohio, and rated by the USDA to survive −5 °F or colder — the bottom of zone 6b. Each links to its USDA PLANTS profile.

Trees 71

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 203

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 165

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 10

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 °Fgraybark grape50 ft · blooms late spring · medium shade tolerance · to −8 °Fheartleaf peppervine2 ft · blooms late spring · low shade tolerance · to −8 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °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 Dayton, OH.

Soil in Dayton, OH

The soil mapped at the center of ZIP 45415 is Miamian — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH6.0slightly acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Miamian-Urban land complex, undulating.

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 45415; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Dayton, OH

Summer high86 °Faverage high, July
Winter low22 °Faverage low, January
Hot days16days a year at 90 °F or more
Freezing nights110nights a year at 32 °F or less
Growing degree days3,757base 50 °F — the season’s usable heat
Longest day15 h 00 mindaylight on June 21
Shortest day9 h 20 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation41.3 inper year, rain and melted snow
Snowfall25 inper year; 27 days with snow on the ground

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 37 °F, low 22 °F 37°22° JanFebruary: average high 41 °F, low 25 °F 41°25° FebMarch: average high 52 °F, low 33 °F 52°33° MarApril: average high 65 °F, low 43 °F 65°43° AprMay: average high 74 °F, low 54 °F 74°54° MayJune: average high 83 °F, low 63 °F 83°63° JunJuly: average high 86 °F, low 66 °F 86°66° JulAugust: average high 85 °F, low 64 °F 85°64° AugSeptember: average high 79 °F, low 57 °F 79°57° SepOctober: average high 66 °F, low 46 °F 66°46° OctNovember: average high 53 °F, low 35 °F 53°35° NovDecember: average high 42 °F, low 27 °F 42°27° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 3.08 in precipitation, 8.3 in snowfall 3.1❄8 JanFebruary: 2.35 in precipitation, 6.6 in snowfall 2.4❄7 FebMarch: 3.50 in precipitation, 3.9 in snowfall 3.5❄4 MarApril: 4.46 in precipitation, 0.4 in snowfall 4.5 AprMay: 4.51 in precipitation 4.5 MayJune: 4.14 in precipitation 4.1 JunJuly: 3.95 in precipitation 4.0 JulAugust: 2.96 in precipitation 3.0 AugSeptember: 3.31 in precipitation 3.3 SepOctober: 2.95 in precipitation, 0.2 in snowfall 3.0 OctNovember: 3.07 in precipitation, 0.8 in snowfall 3.1❄1 NovDecember: 3.05 in precipitation, 4.8 in snowfall 3.0❄5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Dayton Intl Airport, OH (6 mi away); precipitation: Dayton Intl Airport, OH (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

454166b
Dayton, OH · 2 mi
454146b
Dayton, OH · 2 mi
454066b
Dayton, OH · 4 mi
454056b
Dayton, OH · 4 mi
454266b
Dayton, OH · 4 mi
453156a
Clayton, OH · 5 mi
453776b
Vandalia, OH · 5 mi
454026b
Dayton, OH · 6 mi

All 42 ZIP codes in Dayton → · Ohio planting zones →

Questions about 45415

What planting zone is ZIP code 45415?

ZIP code 45415 (Dayton, 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 Dayton, OH?

The median last spring frost (32 °F) near 45415 is April 16; after May 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Dayton Intl Airport station.

When is the first frost in Dayton, OH?

The median first fall frost near 45415 is October 28, giving a median frost-free growing season of 194 days.

When should I plant tomatoes in 45415?

Start tomato seeds indoors around Feb 19 – Mar 5 and set transplants outside around Apr 23 – May 7, one to three weeks after the median last frost.

How much rain and snow does 45415 get?

About 41.3 inches of precipitation a year and 25 inches of snowfall (NOAA 1991–2020 normals, Dayton Intl Airport station).

How hot do summers get in Dayton, OH?

The average high peaks at 86 °F in July, with about 16 days a year at 90 °F or more.

What kind of soil does 45415 have?

The USDA soil survey maps Miamian at the center of ZIP 45415: silt loam, well drained, pH about 6.0 (slightly acidic).

Did spring come early in Dayton, OH in 2026?

Spring leaf-out near 45415 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 Dayton, OH?

Intermediate onions: the longest day near 45415 is 15 h 00 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 45415 change?

Yes. The 2012 USDA map put 45415 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.