Conditional — Some Areas
moonflower (zones 3-11) has limited zone overlap with Virginia (5b-8a). Only zones 5-8 in the state are suitable.
Your yard isn't the whole zone.
Moonflower is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is, and slope, trees, and low spots move the last-frost date across a single yard. Enter your address and we'll score moonflower against your parcel's actual frost dates, sun, and soil.
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Zone Comparison
Moonflower Needs
- USDA Zones: 3-11
- Soil pH: 4.3 - 7.5
- Sun: Full Sun
- Drainage: poorly (saturated >50% of year)
- Frost-Free Days: 30+
Virginia Has
- USDA Zones: 5b-8a
- Last Frost: Mar 20 - May 10
- First Frost: Oct 1 - Nov 10
- Annual Rainfall: 36-50 inches
- Common Soils: Red clay (Piedmont), Silt loam, Sandy loam (Tidewater)
Plant Zone Range (zones 3-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Moonflower in Virginia
The frost window
Across Virginia, the last spring frost clears between Mar 20 and May 10, and the first fall frost lands between Oct 1 and Nov 10 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 144-day window you can count on — up to 235 days on a mild site in a kind year.
Frost tenderness
Moonflower is frost-tender — its listed minimum temperature is 50°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Days to maturity vs. the window
At 80 days to maturity (USDA PLANTS Database), a planting right after last frost ripens with 64 days to spare even in Virginia's tightest frost scenario — room for a later start or a second sowing.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Moonflower wants 30+ frost-free days; a typical Virginia site sees ~220 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Moonflower needs ~1200 GDD (base 50°F) to ripen. The state median runs ~3850 GDD (USDA NRCS county aggregates), so Virginia's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Moonflower likes near-neutral soil (pH 4.3-7.5). That's the common-ground band across Virginia's red clay (piedmont) and silt loam — a soil test confirms it for your site. Drainage requirement: poorly (saturated >50% of year). A soil-survey lookup (NRCS SSURGO) flags whether your specific site matches.
Plant pH and drainage requirements from USDA PLANTS Database. Virginia soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Moonflower in Virginia — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 3-11 (USDA PLANTS Database)
- State Zones: 5b-8a (USDA ARS PHZM 2023)
- Growing Season: Mar 20 - May 10 to Oct 1 - Nov 10 (NOAA Climate Normals)
- Days to Maturity: 80 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Virginia growers also need to think about:
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.
Pollinator + Wildlife Value
Moonflower draws pollinators (high value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Virginia Cooperative Extension
For Virginia-specific cultivar recommendations, planting calendars, and pest pressure for moonflower, the canonical source is Virginia Cooperative Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Moonflower native to Virginia?
Moonflower is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Virginia. It can still earn a place in a Virginia garden — the zone comparison above tells you whether it will thrive.
Looking for plants that belong here? The Virginia growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Moonflower in Virginia
When can I plant Moonflower in Virginia?
Virginia's last spring frost clears between Mar 20 and May 10, and the first fall frost lands between Oct 1 and Nov 10 (NOAA Climate Normals 1991-2020). Moonflower is frost-tender — its listed minimum temperature is 50°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Moonflower mature before first frost in Virginia?
Yes — Moonflower matures in 80 days (USDA PLANTS Database), and Virginia's dependable frost-free window runs 144 days (NOAA Climate Normals 1991-2020), leaving 64 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Moonflower grown in across Virginia?
Virginia spans USDA hardiness zones 5b-8a (USDA ARS PHZM 2023). Moonflower carries a range of zones 3-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Virginia site have?
A typical Virginia site sees ~220 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Moonflower needs 30+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Moonflower native to Virginia?
Moonflower is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Virginia. It can still earn a place in a Virginia garden — the zone comparison above tells you whether it will thrive.
How should I amend the soil for Moonflower in Virginia?
Moonflower prefers pH 4.3-7.5 and poorly (saturated >50% of year) drainage (USDA PLANTS Database). That sits in the common-ground band across Virginia soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Moonflower actually grow on my specific land in Virginia?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores moonflower against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Virginia
State-level data is a sketch. Your Growable Ground report scores moonflower against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
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.
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