Yes — Strong Match
common milkweed (zones 3-9) covers every zone Alabama contains (7b-9b), so hardiness is not what limits it anywhere in the state.
Common Milkweed in Alabama — the short answer
Common Milkweed in Alabama: hardy in zones 3–9, full sun.
- Plant zones
- 3-9
- NC State Extension Gardener Plant Toolbox
- Alabama zones
- 7b-9b
- USDA PHZM 2023
- Frost window
- Feb 24 - Mar 16 – Nov 15 - Nov 28
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 225 days
- NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — per-field provenance varies and is published with the dataset.
Your yard isn't the whole zone.
Alabama spans zones 7b-9b, 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 common milkweed against your parcel's actual hardiness, soil, and sun.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Alabama is not one climate
Alabama’s winter-low ladder runs across 67 counties, from zone 7.5 in Jackson County to zone 9 in Mobile County. That is 15°F between the two counties’ average coldest night — the difference between common milkweed overwintering in the ground and coming under cover.
The middle half of 67 counties runs 8–8.5 zones, with a median of 8.5 zones — a 1.5-zone span end to end.
Measured across 67 Alabama counties. USDA PHZM 2023, per county. Quartiles are order statistics — every figure shown is a value a real county recorded, not an interpolation. Your own site sits somewhere inside this range; a parcel report resolves where.
Where in Alabama Fits Best
Even within Alabama's zones 7b-9b, county microclimates differ enough to change what thrives. These counties carry the closest zone match for common milkweed (USDA PHZM 2023):
Zone Comparison
Common Milkweed Needs
- USDA Zones: 3-9
- Sun: Full Sun
- Mature size: 5 ft tallWe haven't confirmed this against a published source yet.
- Picking window: ~45 days of harvestWe haven't confirmed this against a published source yet.
- Drought tolerance: HighWe haven't confirmed this against a published source yet.
Alabama Has
- USDA Zones: 7b-9b
- Last Hard Freeze (28°F): Feb 24 - Mar 16
- First Hard Freeze (28°F): Nov 15 - Nov 28
- Annual Rainfall: 50-65 inches
- Common Soils: Red clay, Sandy loam, Alluvial
Plant Zone Range (zones 3-9)
Preferred Soil pH
We haven't confirmed this against a published source yet.
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Common Milkweed in Alabama
The frost window
Across Alabama, the last spring hard freeze (28°F) clears between Feb 24 and Mar 16, and the first fall hard freeze lands between Nov 15 and Nov 28 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 244-day window you can count on — up to 277 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
Alabama runs as cold as USDA zone 7, and no sourced winter-hardiness floor is on record for common milkweed, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether common milkweed is a permanent planting or a replant-every-spring crop for you turns on your own zone within Alabama; check its hardiness range against that before treating it as long-lived ground.
Timing tuned to sub-state frost dates — Marion County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Soil + Drainage Fit
Common Milkweed tolerates a wide pH range (pH 4.5-7.5) — 3 units, acid ground through alkaline — so soil acidity is rarely what limits it in Alabama. A soil test is still worth having, but for what else it tells you about this site, not to clear this plant. It will grow across that whole span, but it does best between pH 5 and 7 — worth knowing before you decide whether a Alabama soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Alabama site is heavier clay or sits in a low spot, a raised bed lifts the roots above wet ground, or work in compost. pH range, preferred pH and drainage need: We haven't confirmed this against a published source yet.
Your land, not the state average
SSURGO maps about 14.1% of Alabama as poorly or somewhat-poorly drained, and the class flips parcel to parcel. Common Milkweed tolerates drought well, so wet feet — not dry spells — is its real risk here — your soil map unit, not the state average, is the real answer.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. Alabama soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Common Milkweed in Alabama
Zone compatibility tells you about winter cold survival — but Alabama growers also need to think about:
Heavy clay soils in the Piedmont region
High humidity promotes fungal diseases
Fire ants are a persistent garden pest
Growing common milkweed here specifically
Common Milkweed needs sharp drainage and sends medium roots; its growing tissue takes cold to about 32°F (FAO ECOCROP), but in Alabama, about 14.1% of soils are poorly-drained (SSURGO), and standing water is what actually kills it.
Build common milkweed up on a coarse, free-draining mound so its crown never sit in saturated soil. How to handle it →
What to actually do about these — and the constraints that apply to every Alabama grower, not just common milkweed — is covered on the Alabama growing guide.
Timing shifts within Alabama
Alabama isn't one climate. In Marion County, the last hard freeze (28°F) holds until about Mar 28 — roughly 26 days later than the recorded state median — so plant common milkweed to your county's window, not the statewide date.
County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). A parcel report resolves your address's own frost dates.
Where in Alabama Common Milkweed Is Zone-Hardy
Common Milkweed is rated for USDA zones 3–9. Every one of Alabama’s 67 counties sits inside that band — from Jackson County at zone 7b to Mobile County at zone 9a — so winter cold is not what decides this plant anywhere in the state. What is left to vary is your own parcel: slope, shelter and cold-air drainage routinely move a site half a zone either way from the county figure.
Across those 67 counties Alabama’s winter-low ladder runs from zone 7b in Jackson County to zone 9a in Mobile County — 1.5 USDA zones of spread, which is 15°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. Marion County holds its last hard freeze (28°F) until about Mar 28, while Mobile County is clear by Feb 9 — 47 days apart. Set common milkweed out on your county’s date, not the state’s.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F killing freeze — earlier than the folk 32°F "last frost". Common Milkweed’s zone 3–9 band: NC State Extension Gardener Plant Toolbox. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Pollinator + Wildlife Value
Common Milkweed draws honeybees, native bees, butterflies, and moths (high value, Converted from Rowe et al. 2018 (Michigan conditions)). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, common milkweed can only work that bloom inside Alabama's frost window — roughly 266 days, opening after the last 28°F freeze (Feb 24 - Mar 16) and closing at the first (Nov 15 - Nov 28), per NOAA Regional Climate Centers ACIS, 1991-2020. Pollinator value: We haven't confirmed this against a published source yet.
Good to Know Before You Plant Common Milkweed
Common Milkweed is listed as toxic to dogs, cats (all) at a moderate level. (Source: NC State Extension Gardener Plant Toolbox.) Most listed plants only cause brief upset — a raised bed or a fenced corner usually keeps curious pets clear.
Recommended Common Milkweed Varieties for Alabama
Alabama publishes no state variety trial for common milkweed, so we won't invent a "best for Alabama" list. Choose types rated to your USDA hardiness zone (7b-9b), and confirm winter survival and drainage against your own parcel.
Alabama Cooperative Extension
For Alabama-specific cultivar recommendations, planting calendars, and pest pressure for common milkweed, the canonical source is Alabama Cooperative Extension System. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Common Milkweed native to Alabama?
The USDA PLANTS Database (accessed 2026-10-19) lists Common Milkweed as native to the Lower 48 and records it growing in Alabama, but it does not say whether those Alabama plants are native or introduced. Your state's native plant society or Cooperative Extension can tell you whether it is part of the local flora.
State records: USDA PLANTS Database state-distribution data (presence, not state-level nativity), accessed 2026-10-19.
Common Questions About Growing Common Milkweed in Alabama
When can I plant Common Milkweed in Alabama?
Alabama's last spring hard freeze (28°F) clears between Feb 24 and Mar 16, and the first fall hard freeze lands between Nov 15 and Nov 28 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Common Milkweed, so this page does not state whether it overwinters in Alabama 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 Common Milkweed grown in across Alabama?
Alabama spans USDA hardiness zones 7b-9b (USDA ARS PHZM 2023). Common Milkweed carries a range of zones 3-9, 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 ~266 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Common Milkweed needs 120+ 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 Marion, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Common Milkweed native to Alabama?
The USDA PLANTS Database (accessed 2026-10-19) lists Common Milkweed as native to the Lower 48 and records it growing in Alabama, but it does not say whether those Alabama plants are native or introduced. Your state's native plant society or Cooperative Extension can tell you whether it is part of the local flora.
How should I amend the soil for Common Milkweed in Alabama?
Common Milkweed tolerates pH 4.5-7.5 and well (dry spells) drainage. We haven't confirmed this against a published source yet. That is a 3-unit span, acid ground through alkaline, so pH is rarely what limits this plant on a Alabama site — amend for drainage and organic matter first.
Will Common Milkweed actually grow on my specific land in Alabama?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores common milkweed against your address's mapped 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 common milkweed against your land's mapped soil, modelled sun, drainage, and frost data — not zone averages.
Three things about your lot that Alabama common milkweed averages can't show:
We read public map data around Alabama — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Alabama common milkweed average
Explore More
Growing guides for common milkweed
Explore Alabama county by county
Alabama carries 67 counties with their own USDA zone — a sample of the growing pages for common milkweed there:
Where else common milkweed grows
Common Milkweed's zone band crosses state lines — these are the states closest to Alabama in winter climate where it also has a page, plus the far ends of its range. Each one re-answers the question with that state's own record.
More to grow in Alabama
Alabama has a growing page for 1,029 plants — a rotating sample of the rest of the shelf.
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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