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

Planting zone for Warren, OH

Warren, OH is in USDA zone 6a across its 6 ZIP codes. The median last spring frost is May 8 and the first fall frost October 12.

Warren on the zone map

Outlined: its 4 ZIP code areas · 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
ZIP codes6
Last frostMay 8
First frostOct 12
Growing season157 days

6a 6 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Warren, 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 Warren, OH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 8median — 50% chance of a later frost
Safe for tender plantsMay 25only 10% chance of frost after
First fall frostOctober 12median — 10% chance by Sep 30
Growing season157 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 27 and returns around October 26.

From the NOAA station Warren 3 S, OH, elevation 899 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 Warren

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 27 – Apr 10
SpinachSow outdoors · Mar 27 – Apr 17
Broccoli, cabbageStart indoors · Feb 27 – Mar 13
Broccoli, cabbageTransplant · Apr 17 – May 1
Onion setsPlant outdoors · Apr 10 – Apr 24
PotatoesPlant outdoors · Apr 17 – May 1
LettuceSow outdoors · Apr 10 – Apr 24
Carrots, beetsSow outdoors · Apr 17 – May 1
TomatoesStart indoors · Mar 13 – Mar 27
TomatoesTransplant · May 15 – May 29
Peppers, eggplantStart indoors · Feb 27 – Mar 13
Peppers, eggplantTransplant · May 22 – Jun 5
BeansSow outdoors · May 15 – May 29
Sweet cornSow outdoors · May 15 – May 29
Cucumbers, squashSow outdoors · May 15 – May 29
Fall lettuce, spinachSow outdoors · Aug 17 – Aug 31
GarlicPlant cloves · Sep 28 – Nov 2
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 8) and first fall frost (Oct 12) 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 44483 came on Mar 16 — 17 days earlier than the 1991–2020 average (Apr 2).

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 Warren, OH.

Soil in Warren, OH

The soil mapped at the center of ZIP 44483 is Wadsworth — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter2.9%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classPrime farmland if drainedUSDA classification

Map unit: Wadsworth 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 44483; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Warren, OH

Summer high82 °Faverage high, July
Winter low18 °Faverage low, January
Hot days8days a year at 90 °F or more
Freezing nights133nights a year at 32 °F or less
Growing degree days2,707base 50 °F — the season’s usable heat
Longest day15 h 09 mindaylight on June 21
Shortest day9 h 12 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation42.7 inper year, rain and melted snow
Snowfall40 inper year; 52 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 35 °F, low 18 °F 35°18° JanFebruary: average high 38 °F, low 18 °F 38°18° FebMarch: average high 46 °F, low 25 °F 46°25° MarApril: average high 59 °F, low 36 °F 59°36° AprMay: average high 71 °F, low 46 °F 71°46° MayJune: average high 78 °F, low 56 °F 78°56° JunJuly: average high 82 °F, low 60 °F 82°60° JulAugust: average high 81 °F, low 58 °F 81°58° AugSeptember: average high 75 °F, low 51 °F 75°51° SepOctober: average high 63 °F, low 41 °F 63°41° OctNovember: average high 50 °F, low 32 °F 50°32° NovDecember: average high 40 °F, low 24 °F 40°24° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 2.87 in precipitation, 12.8 in snowfall 2.9❄13 JanFebruary: 2.25 in precipitation, 8.8 in snowfall 2.3❄9 FebMarch: 3.10 in precipitation, 6.8 in snowfall 3.1❄7 MarApril: 3.80 in precipitation, 1.2 in snowfall 3.8❄1 AprMay: 4.20 in precipitation 4.2 MayJune: 4.26 in precipitation 4.3 JunJuly: 4.78 in precipitation 4.8 JulAugust: 3.59 in precipitation 3.6 AugSeptember: 4.27 in precipitation 4.3 SepOctober: 3.63 in precipitation 3.6 OctNovember: 2.97 in precipitation, 2.6 in snowfall 3.0❄3 NovDecember: 2.95 in precipitation, 8 in snowfall 3.0❄8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mosquito Creek Lake, OH (4 mi away); precipitation: Mosquito Creek Lake, OH (4 mi away). Daylight is calculated from latitude.

ZIP codes in Warren

444816a
−10 to −5 °F
444826a
−10 to −5 °F
444836a
−10 to −5 °F
444846a
−10 to −5 °F
444856a
−10 to −5 °F
444866a
−10 to −5 °F

Ohio planting zones →

Questions about Warren

What planting zone is Warren, OH?

Warren, OH is in USDA hardiness zone 6a on the 2023 map (6a: −10 to −5 °F).

When is the last frost in Warren, OH?

The median last spring frost is May 8 and the median first fall frost is October 12 (NOAA 1991–2020 normals, Warren 3 S station).

When can I plant a garden in Warren, OH?

Cool-season crops like peas and spinach go in around Mar 27 – Apr 17; tomatoes, peppers, beans and squash after about May 15, once frost risk has passed.

What kind of onions grow in Warren, OH?

Long-day onions: the longest day is 15 h 09 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

How much rain and snow does Warren, OH get?

About 42.7 inches of precipitation a year and 40 inches of snowfall (NOAA 1991–2020 normals).