Generally — Most Areas
subterranean clover (zones 6-10) partially overlaps with Alabama (7a-9a). It can grow in zones 7-9 within the state.
Your yard isn't the whole zone.
Subterranean Clover 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 subterranean clover against your parcel's actual frost dates, sun, and soil.
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Zone Comparison
Subterranean Clover Needs
- USDA Zones: 6-10
- Soil pH: 5 - 8
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 120+
Alabama Has
- USDA Zones: 7a-9a
- Last Frost: Feb 28 - Apr 5
- First Frost: Oct 25 - Nov 20
- Annual Rainfall: 50-65 inches
- Common Soils: Red clay, Sandy loam, Alluvial
Plant Zone Range (zones 6-10)
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 Subterranean Clover in Alabama
The frost window
Across Alabama, the last spring frost clears between Feb 28 and Apr 5, and the first fall frost lands between Oct 25 and Nov 20 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 203-day window you can count on — up to 265 days on a mild site in a kind year.
Days to maturity vs. the window
At 90 days to maturity (USDA PLANTS Database), a planting right after last frost ripens with 113 days to spare even in Alabama'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
Subterranean Clover wants 120+ frost-free days; a typical Alabama site sees ~220 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Subterranean Clover needs ~800 GDD (base 50°F) to ripen. The state median runs ~5000 GDD (USDA NRCS county aggregates), so Alabama'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
Subterranean Clover likes near-neutral soil (pH 5-8). That's the common-ground band across Alabama's red clay and sandy loam — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Alabama site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. Alabama soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Subterranean Clover in Alabama — Quick Answer
- Verdict: Generally — Most Areas
- Plant Zones: 6-10 (USDA PLANTS Database)
- State Zones: 7a-9a (USDA ARS PHZM 2023)
- Growing Season: Feb 28 - Apr 5 to Oct 25 - Nov 20 (NOAA Climate Normals)
- Days to Maturity: 90 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Alabama growers also need to think about:
Heavy clay soils in the Piedmont region
Open clay with compost over time — or start above it in a raised bed and let the ground catch up underneath.
High humidity promotes fungal diseases
Airflow is the free fungicide: space generously, water at the base in the morning, and pick resistant varieties from your extension's list.
Fire ants are a persistent garden pest
Season-long baiting beats mound-by-mound whack-a-mole — your extension office publishes the current program that works.
Pollinator + Wildlife Value
Subterranean Clover draws pollinators (high value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Alabama Cooperative Extension
For Alabama-specific cultivar recommendations, planting calendars, and pest pressure for subterranean clover, the canonical source is Alabama Cooperative Extension System. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Subterranean Clover native to Alabama?
No — the USDA PLANTS Database lists Subterranean Clover as introduced rather than native in the Lower 48, so it is not part of Alabama's native flora. It grows here as a garden plant; pairing it with a few Alabama natives keeps local pollinators fed too.
Looking for plants that belong here? The Alabama 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 Subterranean Clover in Alabama
When can I plant Subterranean Clover in Alabama?
Alabama's last spring frost clears between Feb 28 and Apr 5, and the first fall frost lands between Oct 25 and Nov 20 (NOAA Climate Normals 1991-2020). Time outdoor planting to after the last-frost date for your specific site, and count back from those dates for transplant scheduling.
Can Subterranean Clover mature before first frost in Alabama?
Yes — Subterranean Clover matures in 90 days (USDA PLANTS Database), and Alabama's dependable frost-free window runs 203 days (NOAA Climate Normals 1991-2020), leaving 113 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Subterranean Clover grown in across Alabama?
Alabama spans USDA hardiness zones 7a-9a (USDA ARS PHZM 2023). Subterranean Clover carries a range of zones 6-10, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Alabama site have?
A typical Alabama site sees ~220 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Subterranean Clover needs 120+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Subterranean Clover native to Alabama?
No — the USDA PLANTS Database lists Subterranean Clover as introduced rather than native in the Lower 48, so it is not part of Alabama's native flora. It grows here as a garden plant; pairing it with a few Alabama natives keeps local pollinators fed too.
How should I amend the soil for Subterranean Clover in Alabama?
Subterranean Clover prefers pH 5-8 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Alabama soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Subterranean Clover actually grow on my specific land in Alabama?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores subterranean clover 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 Alabama
State-level data is a sketch. Your Growable Ground report scores subterranean clover 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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