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

Planting zone for 43449 — Oak Harbor, OH

ZIP code 43449 (Oak Harbor, Ottawa County) is in USDA zone 6b: the coldest winter night averages −5 to 0 °F. The median last spring frost is April 26 and the first fall frost October 23.

Where ZIP 43449 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 26
First frostOct 23
2012 zone6b

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 6b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Oak Harbor, 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 Oak Harbor, 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 13only 10% chance of frost after
First fall frostOctober 23median — 10% chance by Oct 8
Growing season179 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 14 and returns around November 2.

From the NOAA station Fremont, OH — 14 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 43449

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 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 26) 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 43449 came on Mar 21 — 14 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 Oak Harbor, OH.

Soil in Oak Harbor, OH

The soil mapped at the center of ZIP 43449 is Toledo — silty clay, very poorly drained.

TextureSilty clayholds water and nutrients; slow to drain and warm up
pH6.4slightly acidic; most vegetables like 6.0–7.0
DrainageVery poorly drainedconsider raised beds
Organic matter4.34%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classPrime farmland if drainedUSDA classification

Map unit: Toledo silty clay, 0 to 1 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 43449; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Oak Harbor, OH

Summer high85 °Faverage high, July
Winter low19 °Faverage low, January
Hot days21days a year at 90 °F or more
Freezing nights126nights a year at 32 °F or less
Growing degree days3,170base 50 °F — the season’s usable heat
Longest day15 h 11 mindaylight on June 21
Shortest day9 h 10 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation38.2 inper year, rain and melted snow

Average high and low, by month

10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 34 °F, low 19 °F 34°19° JanFebruary: average high 37 °F, low 20 °F 37°20° FebMarch: average high 47 °F, low 28 °F 47°28° MarApril: average high 60 °F, low 38 °F 60°38° AprMay: average high 72 °F, low 49 °F 72°49° MayJune: average high 81 °F, low 60 °F 81°60° JunJuly: average high 85 °F, low 63 °F 85°63° JulAugust: average high 83 °F, low 61 °F 83°61° AugSeptember: average high 77 °F, low 54 °F 77°54° SepOctober: average high 64 °F, low 42 °F 64°42° OctNovember: average high 50 °F, low 33 °F 50°33° NovDecember: average high 39 °F, low 25 °F 39°25° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 2.73 in precipitation 2.7 JanFebruary: 2.15 in precipitation 2.1 FebMarch: 2.89 in precipitation 2.9 MarApril: 3.73 in precipitation 3.7 AprMay: 3.74 in precipitation 3.7 MayJune: 4.27 in precipitation 4.3 JunJuly: 3.82 in precipitation 3.8 JulAugust: 3.63 in precipitation 3.6 AugSeptember: 3.31 in precipitation 3.3 SepOctober: 2.83 in precipitation 2.8 OctNovember: 2.68 in precipitation 2.7 NovDecember: 2.39 in precipitation 2.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Fremont, OH (14 mi away); precipitation: Elmore 5 E, OH (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 6b.

434586b
Rocky Ridge, OH · 4 mi
434326b
Graytown, OH · 6 mi
434166b
Elmore, OH · 8 mi
434426b
Lindsey, OH · 9 mi
434456b
Martin, OH · 9 mi
434526b
Port Clinton, OH · 10 mi
434126b
Curtice, OH · 12 mi
434686b
Williston, OH · 12 mi

Ohio planting zones →

Questions about 43449

What planting zone is ZIP code 43449?

ZIP code 43449 (Oak Harbor, 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 Oak Harbor, OH?

The median last spring frost (32 °F) near 43449 is April 26; after May 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Fremont station.

When is the first frost in Oak Harbor, OH?

The median first fall frost near 43449 is October 23, giving a median frost-free growing season of 179 days.

When should I plant tomatoes in 43449?

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 43449 get?

About 38.2 inches of precipitation a year (NOAA 1991–2020 normals, Elmore 5 E station).

How hot do summers get in Oak Harbor, OH?

The average high peaks at 85 °F in July, with about 21 days a year at 90 °F or more.

What kind of soil does 43449 have?

The USDA soil survey maps Toledo at the center of ZIP 43449: silty clay, very poorly drained, pH about 6.4 (slightly acidic).

Did spring come early in Oak Harbor, OH in 2026?

Spring leaf-out near 43449 came on Mar 21 in 2026, 14 days earlier than the 1991–2020 average (Apr 4), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Oak Harbor, OH?

Long-day onions: the longest day near 43449 is 15 h 11 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).