Portsmouth, Virginia, sits in USDA hardiness zones 7a-8b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with tomato, grape, peanut, and dogwood — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Portsmouth, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Portsmouth lot. Enter your address and we'll score 1,112 plants against your land's actual soil, sun, and frost.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Quick Facts
USDA Zones
7a-8b
Last Frost (state avg.)
Mar 20 - May 10
First Frost (state avg.)
Oct 1 - Nov 10
City Area
21K acres
Hardiness Zone Range
Growing Season
Zone maps are averages across Portsmouth. Your yard's slope, trees, and frost pockets shift what actually grows — see your land's exact reading.
Soil varies lot by lot — soil types explained.
What Grows in Portsmouth
Plants matched to Portsmouth's USDA zones 7a-8b — each links to its full growing profile.
Growing Challenges in Virginia
What an experienced grower plans around here — each one has a move.
Heavy Piedmont red clay requires amendment
Red clay turns from obstacle to asset with compost and time — and a raised bed lets you harvest while it happens.
Humidity and heat in summer promote disease
Space for airflow, water mornings at the base, and plant resistant varieties — your extension's humid-summer playbook.
Deer pressure is heavy in suburban and rural areas
A proper fence settles it; outside the fence, genuinely deer-resistant plants are the next best defense.
For cultivar selection, pest pressure, and planting-time guidance specific to Virginia, the Virginia Cooperative Extension is the authoritative local source.
Environmental Intelligence
Understanding what's nearby helps you make informed decisions about where and how to grow.
Sources Checked
within ~10 miles of Portsmouth
Severity Distribution
within ~10 miles of Portsmouth
Highest-Severity Sites
Know Before You Grow
- •Underground tanks can leak petroleum products. Soil testing near former gas stations is recommended.
- •Raised beds with imported soil can reduce exposure risk near brownfield sites.
- •TRI facilities report chemical releases. Check wind direction — downwind parcels face higher airborne exposure.
Check your specific parcel in Portsmouth
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,112 plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Your Specific Parcel Matters
Portsmouth Average
- ●USDA Zones 7a-8b
- ●Generic soil type for the area
- ●State-average frost dates
YOUR Parcel
- ✓Your exact hardiness zone
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Portsmouth
Pull a site-specific report for your exact address in Portsmouth, Virginia — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
Key Growing Facts for Portsmouth, Virginia
- USDA Hardiness Zones: 7a-8b (USDA PHZM 2023)
- Last Spring Frost (state avg.): Mar 20 - May 10 (NOAA 30-Year Climate Normals)
- First Fall Frost (state avg.): Oct 1 - Nov 10 (NOAA 30-Year Climate Normals)
- Land Area: 21K acres (US Census TIGER 2025)
Zone data: USDA ARS Plant Hardiness Zone Map 2023. Climate data: NOAA NCEI. Boundaries: US Census TIGER/Line 2025.
Frequently Asked Questions
What hardiness zone is Portsmouth, Virginia?
Portsmouth sits in USDA hardiness zones 7a-8b, per the USDA Plant Hardiness Zone Map 2023. Zones reflect average annual extreme minimum temperatures from 1991–2020 weather data.
When does frost risk typically end in Portsmouth?
Portsmouth follows Virginia's statewide frost window: last spring frost around Mar 20 - May 10 and first fall frost around Oct 1 - Nov 10, per NOAA 30-year climate normals (1991–2020). Frost dates shift with elevation and local microclimate, so watch your own site's cold pockets.
What vegetables grow in Portsmouth?
Portsmouth's zones 7a-8b support a wide range — strong performers include Tomato, Grape, Peanut, Dogwood, and Apple. What actually takes on any one site comes down to its soil, sun, and drainage, and we score each plant against the real conditions at your address.
Which hardiness zone is Portsmouth, really?
Officially, Portsmouth sits in USDA zones 7a-8b (USDA PHZM 2023) — but a zone is a 30-year average of winter's coldest night across an area, and it can't see any one yard. A south-facing slope, a tree line, or a low frost pocket can shift a single site by half a zone either way, which is why neighboring gardeners often quote different numbers. We read the conditions at your exact address — soil, sun, slope, and frost — and score 1,112 plants against what's actually there.
Is the soil safe to grow vegetables in Portsmouth?
The federal record around Portsmouth runs heavier than most — 2,607 documented sites — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Portsmouth?
As the season closes around Virginia's first fall frost near Oct 1 - Nov 10 (NOAA 30-year climate normals (1991–2020)), a few moves buy time: cover tender plants with floating row cover or an old sheet on still, clear nights, water the soil the afternoon before a freeze so it holds warmth overnight, and harvest frost-tender crops like tomatoes, peppers, and basil before the first hard night. Hardy greens and root crops shrug off light frost and often sweeten after it, so leave them in.
Everything on this page is a Portsmouth average. Your yard writes its own version — we read soil, sun, drainage, and frost at your exact address. Try it for 14 days — no card required.
More in Virginia
Growing region
Nearby growing guides