Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 45662 — Portsmouth, OH

ZIP code 45662 (Portsmouth, Scioto County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 17 and the first fall frost October 25.

Where ZIP 45662 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostApr 17

First frostOct 25

2012 zone6b

Was 6b 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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Portsmouth, 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 Portsmouth, OH

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostApril 17median — 50% chance of a later frost

Safe for tender plantsMay 5only 10% chance of frost after

First fall frostOctober 25median — 10% chance by Oct 11

Growing season191 daysfrost-free, median

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

From the NOAA station Portsmouth-Sciotoville, OH — 2 miles away, elevation 541 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 45662

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 6 – Mar 20

SpinachSow outdoors · Mar 6 – Mar 27

Broccoli, cabbageStart indoors · Feb 6 – Feb 20

Broccoli, cabbageTransplant · Mar 27 – Apr 10

Onion setsPlant outdoors · Mar 20 – Apr 3

PotatoesPlant outdoors · Mar 27 – Apr 10

LettuceSow outdoors · Mar 20 – Apr 3

Carrots, beetsSow outdoors · Mar 27 – Apr 10

TomatoesStart indoors · Feb 20 – Mar 6

TomatoesTransplant · Apr 24 – May 8

Peppers, eggplantStart indoors · Feb 6 – Feb 20

Peppers, eggplantTransplant · May 1 – May 15

BeansSow outdoors · Apr 24 – May 8

Sweet cornSow outdoors · Apr 24 – May 8

Cucumbers, squashSow outdoors · Apr 24 – May 8

Fall lettuce, spinachSow outdoors · Aug 30 – Sep 13

GarlicPlant cloves · Oct 11 – Nov 15

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 17) and first fall frost (Oct 25) 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 45662 came on Mar 8 — 11 days earlier than the 1991–2020 average (Mar 19).

average
Mar 192026
Mar 8

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 7a in Ohio

579 plants native to the lower 48 states, recorded in Ohio, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. Each links to its USDA PLANTS profile.

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 Portsmouth, OH.

Soil in Portsmouth, OH

The soil mapped at the center of ZIP 45662 is Shelocta — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH5.0strongly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.75%moderate

Hydrologic groupBwater soaks in moderately

Farmland classNot prime farmlandUSDA classification

Map unit: Shelocta-Brownsville association, very steep.

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 45662; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Portsmouth, OH

Summer high87 °Faverage high, July

Winter low23 °Faverage low, January

Hot days26days a year at 90 °F or more

Freezing nights106nights a year at 32 °F or less

Growing degree days3,784base 50 °F — the season’s usable heat

Longest day14 h 53 mindaylight on June 21

Shortest day9 h 27 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation43.1 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Portsmouth-Sciotoville, OH (2 mi away); precipitation: Portsmouth-Sciotoville, OH (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

456996b

Lucasville, OH · 6 mi

456947a

Wheelersburg, OH · 8 mi

411747a

South Portsmouth, KY · 8 mi

456536b

Minford, OH · 8 mi

456777a

Scioto Furnace, OH · 8 mi

456526b

Mc Dermott, OH · 9 mi

456486b

Lucasville, OH · 10 mi

411756b

South Shore, KY · 10 mi

Ohio planting zones →

Questions about 45662

What planting zone is ZIP code 45662?

ZIP code 45662 (Portsmouth, OH) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Portsmouth, OH?

The median last spring frost (32 °F) near 45662 is April 17; after May 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Portsmouth-Sciotoville station.

When is the first frost in Portsmouth, OH?

The median first fall frost near 45662 is October 25, giving a median frost-free growing season of 191 days.

When should I plant tomatoes in 45662?

Start tomato seeds indoors around Feb 20 – Mar 6 and set transplants outside around Apr 24 – May 8, one to three weeks after the median last frost.

How much rain and snow does 45662 get?

About 43.1 inches of precipitation a year (NOAA 1991–2020 normals, Portsmouth-Sciotoville station).

How hot do summers get in Portsmouth, OH?

The average high peaks at 87 °F in July, with about 26 days a year at 90 °F or more.

What kind of soil does 45662 have?

The USDA soil survey maps Shelocta at the center of ZIP 45662: silt loam, well drained, pH about 5.0 (strongly acidic).

Did spring come early in Portsmouth, OH in 2026?

Spring leaf-out near 45662 came on Mar 8 in 2026, 11 days earlier than the 1991–2020 average (Mar 19), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Portsmouth, OH?

Intermediate onions: the longest day near 45662 is 14 h 53 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 45662 change?

Yes. The 2012 USDA map put 45662 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.