Unlikely — Zone Mismatch
casimiroa (zones 9-11) does not overlap with West Virginia's zone range (5b-7a). Growing outdoors is unlikely without significant protection.
2 zones short — what would close it
Casimiroa is hardy to zone 9, and the warmest ground in West Virginia is zone 7 — 2 zones short. Planted in open ground it will not survive a West Virginia winter. To grow it here, grow casimiroa under glass — a greenhouse is the only lift this wide the engine models.
A greenhouse is the lift this needs. How a greenhouse changes what you can grow →
Zone math from 9-11 (plant) against 5-7 (West Virginia). Lift modeled by crop_engine Sprint 20B effective_zone_modifier (+2 zones) via api/fast_sections.py Unlock Engine v2.
Your yard isn't the whole zone.
West Virginia spans zones 5b-7a, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score casimiroa against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Casimiroa Needs
- USDA Zones: 9-11
- Frost-Free Days: 210+
- Sun: Full Sun
West Virginia Has
- USDA Zones: 5b-7a
- Last Hard Freeze (28°F): Apr 4 - Apr 15
- First Hard Freeze (28°F): Oct 26 - Nov 5
- Annual Rainfall: 38-56 inches
- Common Soils: Shale-derived, Sandy loam, Clay loam
Plant Zone Range (zones 9-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Casimiroa in West Virginia
The frost window
Across West Virginia, the last spring hard freeze (28°F) clears between Apr 4 and Apr 15, and the first fall hard freeze lands between Oct 26 and Nov 5 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 194-day window you can count on — up to 215 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Winter standing
West Virginia runs as cold as USDA zone 5, and no sourced winter-hardiness floor is on record for casimiroa, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether casimiroa is a permanent planting or a replant-every-spring crop for you turns on your own zone within West Virginia; check its hardiness range against that before treating it as long-lived ground.
Timing tuned to sub-state frost dates — Pocahontas County, not the statewide average.
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
The zone check says casimiroa does not survive a West Virginia winter in the ground. The season figures below measure a different question — whether it could finish a season here at all — and they only bear on West Virginia under protection.
Frost-free days
Casimiroa wants 210+ frost-free days; a typical West Virginia site sees ~204 (NOAA Regional Climate Centers ACIS, 1991-2020) — 6 days short of what it needs. A typical West Virginia season does not carry this crop to harvest outdoors, and a gap that size is not one an earlier sowing date or a faster cultivar closes; growing it here means growing it under cover.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Casimiroa likes near-neutral soil (pH 6.5-8). That's the common-ground band across West Virginia's shale-derived and sandy loam — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 7 and 7.5 — worth knowing before you decide whether a West Virginia soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your West Virginia site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
West Virginia soil pH runs about 4.7–5.5, and that sits below casimiroa's tolerated 6.5–8, so the typical West Virginia parcel needs lime before it will perform. SSURGO maps it swinging by full points parcel to parcel, so your map unit, not the state number, decides whether casimiroa needs lime or sulfur.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. West Virginia soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Casimiroa in West Virginia — Quick Answer
- Verdict: Unlikely — Zone Mismatch
- Plant Zones: 9-11 (USDA PLANTS Database)
- State Zones: 5b-7a (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Apr 4 - Apr 15 to Oct 26 - Nov 5 (NOAA Regional Climate Centers ACIS, 1991-2020)
What Else to Consider for Casimiroa in West Virginia
Zone compatibility tells you about winter cold survival — but West Virginia growers also need to think about:
Steep terrain limits usable growing area
Thin acidic soils over shale bedrock
Short mountain valley growing seasons
Growing casimiroa here specifically
Casimiroa needs near-neutral ground (pH 6.5–8.0); West Virginia's dominant SSURGO pH sits near 5.1, acidic enough to stunt it without correction.
Add lime to bring your parcel up toward pH 6.5–8.0, then retest before setting casimiroa out. How to handle it →
What to actually do about these — and the constraints that apply to every West Virginia grower, not just casimiroa — is covered on the West Virginia growing guide.
Timing shifts within West Virginia
West Virginia isn't one climate. In Pocahontas County, the last hard freeze (28°F) holds until about Apr 30 — roughly 20 days later than the recorded state median — so plant casimiroa to your county's window, not the statewide date.
Casimiroa needs about 210 days of frost-free season to complete its cycle. 20 of West Virginia’s 55 counties give it that outright. The tightest that does is Monongalia County at 211 frost-free days — 1 to spare. Below that line you are transplanting or extending the season, not direct-sowing.
Across West Virginia’s 55 counties the frost-free season runs from 170 days in Pocahontas County to 232 days in Logan County — a spread of 62 days, which is why a single statewide planting date misleads. The median West Virginia county sees 204 frost-free days, which is 6 days short of what casimiroa needs — so on a typical West Virginia parcel this is a transplant-or-protect crop, not a direct-sow one.
County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Casimiroa's 210-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Casimiroa draws honeybees (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, casimiroa can only work that bloom inside West Virginia's frost window — roughly 204 days, opening after the last 28°F freeze (Apr 4 - Apr 15) and closing at the first (Oct 26 - Nov 5), per NOAA Regional Climate Centers ACIS, 1991-2020.
West Virginia Cooperative Extension
For West Virginia-specific cultivar recommendations, planting calendars, and pest pressure for casimiroa, the canonical source is WVU Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Common Questions About Growing Casimiroa in West Virginia
When can I plant Casimiroa in West Virginia?
West Virginia's last spring hard freeze (28°F) clears between Apr 4 and Apr 15, and the first fall hard freeze lands between Oct 26 and Nov 5 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Casimiroa, so this page does not state whether it overwinters in West Virginia and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Casimiroa grown in across West Virginia?
West Virginia spans USDA hardiness zones 5b-7a (USDA ARS PHZM 2023). Casimiroa carries a range of zones 9-11, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical West Virginia site have?
A typical West Virginia site sees ~204 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Casimiroa needs 210+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like Pocahontas, the freeze-free season runs shorter than the state average, so verify your own county's window.
How should I amend the soil for Casimiroa in West Virginia?
Casimiroa prefers pH 6.5-8 and well (dry spells) drainage (FAO ECOCROP). That sits in the common-ground band across West Virginia soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Casimiroa actually grow on my specific land in West Virginia?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores casimiroa 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 West Virginia
State-level data is a sketch. Your Growable Ground report scores casimiroa against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that West Virginia casimiroa averages can't show:
We read public map data around West Virginia — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the West Virginia casimiroa average
Explore More
Growing guides for casimiroa
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →
Cite this dataset
Kirchick, M. (2026). Growable Ground Plant Database [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21435643
Licensed CC BY-NC 4.0. DOI 10.5281/zenodo.21435643
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