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

Planting zone for 44088 — Unionville, OH

ZIP code 44088 (Unionville, Ashtabula County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 15 and the first fall frost November 9.

Where ZIP 44088 is

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 15
First frostNov 9
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 Unionville, 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 Unionville, OH

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 15median — 50% chance of a later frost
Safe for tender plantsApril 27only 10% chance of frost after
First fall frostNovember 9median — 10% chance by Oct 30
Growing season209 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 4 and returns around November 21.

From the NOAA station Painesville 4 Nw, OH — 15 miles away, elevation 600 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 44088

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 4 – Mar 18
SpinachSow outdoors · Mar 4 – Mar 25
Broccoli, cabbageStart indoors · Feb 4 – Feb 18
Broccoli, cabbageTransplant · Mar 25 – Apr 8
Onion setsPlant outdoors · Mar 18 – Apr 1
PotatoesPlant outdoors · Mar 25 – Apr 8
LettuceSow outdoors · Mar 18 – Apr 1
Carrots, beetsSow outdoors · Mar 25 – Apr 8
TomatoesStart indoors · Feb 18 – Mar 4
TomatoesTransplant · Apr 22 – May 6
Peppers, eggplantStart indoors · Feb 4 – Feb 18
Peppers, eggplantTransplant · Apr 29 – May 13
BeansSow outdoors · Apr 22 – May 6
Sweet cornSow outdoors · Apr 22 – May 6
Cucumbers, squashSow outdoors · Apr 22 – May 6
Fall lettuce, spinachSow outdoors · Sep 14 – Sep 28
GarlicPlant cloves · Oct 26 – Nov 30
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 15) and first fall frost (Nov 9) 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 44088 came on Mar 18 — 17 days earlier than the 1991–2020 average (Apr 4).

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 Unionville, OH.

Soil in Unionville, OH

The soil mapped at the center of ZIP 44088 is Conneaut — silt loam, somewhat poorly drained.

TextureSilt loama good balance for most vegetables
pH5.9moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter2%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classPrime farmland if drainedUSDA classification

Map unit: Conneaut silt loam, 1 to 4 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 44088; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Unionville, OH

Summer high82 °Faverage high, July
Winter low24 °Faverage low, January
Hot days5days a year at 90 °F or more
Freezing nights100nights a year at 32 °F or less
Growing degree days3,393base 50 °F — the season’s usable heat
Longest day15 h 13 mindaylight on June 21
Shortest day9 h 08 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation47.1 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 37 °F, low 24 °F 37°24° JanFebruary: average high 39 °F, low 24 °F 39°24° FebMarch: average high 46 °F, low 30 °F 46°30° MarApril: average high 58 °F, low 40 °F 58°40° AprMay: average high 69 °F, low 51 °F 69°51° MayJune: average high 78 °F, low 62 °F 78°62° JunJuly: average high 82 °F, low 67 °F 82°67° JulAugust: average high 82 °F, low 66 °F 82°66° AugSeptember: average high 76 °F, low 59 °F 76°59° SepOctober: average high 65 °F, low 49 °F 65°49° OctNovember: average high 53 °F, low 39 °F 53°39° NovDecember: average high 42 °F, low 30 °F 42°30° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 3.40 in precipitation 3.4 JanFebruary: 2.55 in precipitation 2.5 FebMarch: 3.45 in precipitation 3.5 MarApril: 3.98 in precipitation 4.0 AprMay: 4.26 in precipitation 4.3 MayJune: 4.71 in precipitation 4.7 JunJuly: 4.74 in precipitation 4.7 JulAugust: 4.07 in precipitation 4.1 AugSeptember: 4.52 in precipitation 4.5 SepOctober: 4.27 in precipitation 4.3 OctNovember: 3.62 in precipitation 3.6 NovDecember: 3.52 in precipitation 3.5 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Painesville 4 Nw, OH (15 mi away); precipitation: Montville 1.2 Sse, OH (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

440416b
Geneva, OH · 3 mi
440576b
Madison, OH · 3 mi
440816b
Perry, OH · 7 mi
440866a
Thompson, OH · 8 mi
440106a
Austinburg, OH · 8 mi
440846a
Rock Creek, OH · 9 mi
440046b
Ashtabula, OH · 12 mi
440776b
Painesville, OH · 12 mi

Ohio planting zones →

Questions about 44088

What planting zone is ZIP code 44088?

ZIP code 44088 (Unionville, 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 Unionville, OH?

The median last spring frost (32 °F) near 44088 is April 15; after April 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Painesville 4 Nw station.

When is the first frost in Unionville, OH?

The median first fall frost near 44088 is November 9, giving a median frost-free growing season of 209 days.

When should I plant tomatoes in 44088?

Start tomato seeds indoors around Feb 18 – Mar 4 and set transplants outside around Apr 22 – May 6, one to three weeks after the median last frost.

How much rain and snow does 44088 get?

About 47.1 inches of precipitation a year (NOAA 1991–2020 normals, Montville 1.2 Sse station).

How hot do summers get in Unionville, OH?

The average high peaks at 82 °F in July, with about 5 days a year at 90 °F or more.

What kind of soil does 44088 have?

The USDA soil survey maps Conneaut at the center of ZIP 44088: silt loam, somewhat poorly drained, pH about 5.9 (moderately acidic).

Did spring come early in Unionville, OH in 2026?

Spring leaf-out near 44088 came on Mar 18 in 2026, 17 days earlier than the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Unionville, OH?

Long-day onions: the longest day near 44088 is 15 h 13 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 44088 change?

Yes. The 2012 USDA map put 44088 in zone 6a; the 2023 map puts it in zone 6b. The newer map uses 1991–2020 data and more weather stations.