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

Planting zone for 43318 — De Graff, OH

ZIP code 43318 (De Graff, Logan County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is April 26 and the first fall frost October 20.

Where ZIP 43318 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 26
First frostOct 20
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 De Graff, 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 De Graff, OH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 26median — 50% chance of a later frost
Safe for tender plantsMay 12only 10% chance of frost after
First fall frostOctober 20median — 10% chance by Oct 7
Growing season175 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 16 and returns around October 30.

From the NOAA station Bellefontaine, OH — 8 miles away, elevation 1,175 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 43318

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 15 – Mar 29
SpinachSow outdoors · Mar 15 – Apr 5
Broccoli, cabbageStart indoors · Feb 15 – Mar 1
Broccoli, cabbageTransplant · Apr 5 – Apr 19
Onion setsPlant outdoors · Mar 29 – Apr 12
PotatoesPlant outdoors · Apr 5 – Apr 19
LettuceSow outdoors · Mar 29 – Apr 12
Carrots, beetsSow outdoors · Apr 5 – Apr 19
TomatoesStart indoors · Mar 1 – Mar 15
TomatoesTransplant · May 3 – May 17
Peppers, eggplantStart indoors · Feb 15 – Mar 1
Peppers, eggplantTransplant · May 10 – May 24
BeansSow outdoors · May 3 – May 17
Sweet cornSow outdoors · May 3 – May 17
Cucumbers, squashSow outdoors · May 3 – May 17
Fall lettuce, spinachSow outdoors · Aug 25 – Sep 8
GarlicPlant cloves · Oct 6 – Nov 10
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 26) and first fall frost (Oct 20) 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 43318 came on Mar 10 — 19 days earlier than the 1991–2020 average (Mar 29).

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 De Graff, OH

The soil mapped at the center of ZIP 43318 is Sloan — silt loam, very poorly drained.

TextureSilt loama good balance for most vegetables
pH7.0neutral; most vegetables like 6.0–7.0
DrainageVery poorly drainedconsider raised beds
Organic matter4.5%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: Sloan silt loam.

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 43318; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in De Graff, OH

Summer high83 °Faverage high, July
Winter low18 °Faverage low, January
Hot days8days a year at 90 °F or more
Freezing nights127nights a year at 32 °F or less
Growing degree days3,138base 50 °F — the season’s usable heat
Longest day15 h 03 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)
Precipitation42.6 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 34 °F, low 18 °F 34°18° JanFebruary: average high 37 °F, low 20 °F 37°20° FebMarch: average high 48 °F, low 29 °F 48°29° MarApril: average high 61 °F, low 39 °F 61°39° AprMay: average high 71 °F, low 51 °F 71°51° MayJune: average high 80 °F, low 60 °F 80°60° JunJuly: average high 83 °F, low 63 °F 83°63° JulAugust: average high 81 °F, low 62 °F 81°62° AugSeptember: average high 76 °F, low 54 °F 76°54° SepOctober: average high 64 °F, low 43 °F 64°43° OctNovember: average high 50 °F, low 32 °F 50°32° NovDecember: average high 38 °F, low 24 °F 38°24° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.04 in precipitation 3.0 JanFebruary: 2.46 in precipitation 2.5 FebMarch: 3.20 in precipitation 3.2 MarApril: 4.11 in precipitation 4.1 AprMay: 4.31 in precipitation 4.3 MayJune: 4.96 in precipitation 5.0 JunJuly: 4.45 in precipitation 4.5 JulAugust: 3.90 in precipitation 3.9 AugSeptember: 3.18 in precipitation 3.2 SepOctober: 2.82 in precipitation 2.8 OctNovember: 3.13 in precipitation 3.1 NovDecember: 3.08 in precipitation 3.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bellefontaine, OH (8 mi away); precipitation: Bellefontaine, OH (8 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6a.

433436a
Quincy, OH · 4 mi
430706a
Rosewood, OH · 7 mi
453536a
Pemberton, OH · 7 mi
453406a
Maplewood, OH · 8 mi
433336a
Lewistown, OH · 9 mi
433116a
Bellefontaine, OH · 9 mi
453606a
Port Jefferson, OH · 10 mi
433576a
West Liberty, OH · 10 mi

Ohio planting zones →

Questions about 43318

What planting zone is ZIP code 43318?

ZIP code 43318 (De Graff, 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 De Graff, OH?

The median last spring frost (32 °F) near 43318 is April 26; after May 12 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bellefontaine station.

When is the first frost in De Graff, OH?

The median first fall frost near 43318 is October 20, giving a median frost-free growing season of 175 days.

When should I plant tomatoes in 43318?

Start tomato seeds indoors around Mar 1 – Mar 15 and set transplants outside around May 3 – May 17, one to three weeks after the median last frost.

How much rain and snow does 43318 get?

About 42.6 inches of precipitation a year (NOAA 1991–2020 normals, Bellefontaine station).

How hot do summers get in De Graff, OH?

The average high peaks at 83 °F in July, with about 8 days a year at 90 °F or more.

What kind of soil does 43318 have?

The USDA soil survey maps Sloan at the center of ZIP 43318: silt loam, very poorly drained, pH about 7.0 (neutral).

Did spring come early in De Graff, OH in 2026?

Spring leaf-out near 43318 came on Mar 10 in 2026, 19 days earlier than the 1991–2020 average (Mar 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in De Graff, OH?

Long-day onions: the longest day near 43318 is 15 h 03 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).