Yes — Strong Match
Wimmera ryegrass (zones 5-10) covers every zone Georgia contains (7a-9b), so hardiness is not what limits it anywhere in the state.
Your yard isn't the whole zone.
Wimmera Ryegrass is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is. A typical Georgia site runs ~275 frost-free days, but that is a state median, not your yard: slope, trees, and low spots move the last-frost date across a single parcel. Enter your address and we'll score wimmera ryegrass against your land's actual frost dates, sun, and soil.
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Zone Comparison
Wimmera Ryegrass Needs
- USDA Zones: 5-10
- Frost-Free Days: 70+
- Sun: Full Sun
- Drought tolerance: Low
Georgia Has
- USDA Zones: 7a-9b
- Last Hard Freeze (28°F): Feb 17 - Mar 10
- First Hard Freeze (28°F): Nov 24 - Dec 4
- Annual Rainfall: 45-55 inches
- Common Soils: Red clay (Piedmont), Sandy loam (Coastal Plain), Alluvial
Plant Zone Range (zones 5-10)
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 Wimmera Ryegrass in Georgia
The frost window
Across Georgia, the last spring hard freeze (28°F) clears between Feb 17 and Mar 10, and the first fall hard freeze lands between Nov 24 and Dec 4 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 259-day window you can count on — up to 290 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.
Frost tenderness
Wimmera Ryegrass is frost-tender — its listed minimum temperature is 41°F (USDA PLANTS Database) — so set plants out two to three weeks PAST your local last hard freeze, not on it and not on the state's earliest date. The 28°F marker above is when killing freezes stop, not when light frost does.
When to start the seed
Wimmera Ryegrass is direct-sown where it grows rather than started under cover, so there is no seed-tray head start to bank — Georgia's dates above are the whole calendar for it. That makes the last-freeze date the binding constraint, and a warmer pocket of your own yard is worth more to this crop than it is to a transplanted one.
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 wimmera ryegrass survives winter here. Whether the season is long enough — and warm enough — is a different question.
Frost-free days
Wimmera Ryegrass wants 70+ frost-free days; a typical Georgia site sees ~275 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
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
Wimmera Ryegrass likes near-neutral soil (pH 6-8). That's the common-ground band across Georgia's red clay (piedmont) and sandy loam (coastal plain) — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 6.5 and 7 — worth knowing before you decide whether a Georgia soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Georgia 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. Georgia soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Wimmera Ryegrass in Georgia — Quick Answer
- Verdict: Yes — Strong Match
- Plant Zones: 5-10 (USDA PLANTS Database)
- State Zones: 7a-9b (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Feb 17 - Mar 10 to Nov 24 - Dec 4 (NOAA Regional Climate Centers ACIS, 1991-2020)
What Else to Consider for Wimmera Ryegrass in Georgia
Zone compatibility tells you about winter cold survival — but Georgia growers also need to think about:
Heavy red Piedmont clay is difficult to work and drains poorly
High humidity drives fungal diseases in summer
Fire ants are a persistent pest in gardens across the state
Summer heat (90-100F) can stress cool-season crops by May
What to actually do about these — and the constraints that apply to every Georgia grower, not just wimmera ryegrass — is covered on the Georgia growing guide.
Timing shifts within Georgia
Wimmera Ryegrass needs about 70 days of frost-free season to complete its cycle. Even Towns County — Georgia’s shortest season at 204 frost-free days — clears that by 134 days, so season length isn’t the constraint anywhere in Georgia. What varies is your own parcel.
Across Georgia’s 159 counties the frost-free season runs from 204 days in Towns County to 305 days in Colquitt County — a spread of 101 days, which is why a single statewide planting date misleads. The median Georgia county sees 275 frost-free days, leaving wimmera ryegrass about 205 days of slack on a typical parcel — room for a second sowing where the season runs long.
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"). Wimmera Ryegrass's 70-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Where in Georgia Fits Best
Even within Georgia's zones 7a-9b, county microclimates differ enough to change what thrives. These counties carry the closest zone match for wimmera ryegrass (USDA PHZM 2023):
Georgia Cooperative Extension
For Georgia-specific cultivar recommendations, planting calendars, and pest pressure for wimmera ryegrass, the canonical source is UGA Cooperative Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Wimmera Ryegrass native to Georgia?
No — the USDA PLANTS Database lists Wimmera Ryegrass as introduced rather than native in the Lower 48, so it is not part of Georgia's native flora. It grows here as a garden plant; pairing it with a few Georgia natives keeps local pollinators fed too.
Looking for plants that belong here? The Georgia 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 Wimmera Ryegrass in Georgia
When can I plant Wimmera Ryegrass in Georgia?
Georgia's last spring hard freeze (28°F) clears between Feb 17 and Mar 10, and the first fall hard freeze lands between Nov 24 and Dec 4 (NOAA Regional Climate Centers ACIS, 1991-2020). Wimmera Ryegrass is frost-tender — its listed minimum temperature is 41°F (USDA PLANTS Database) — so wait two to three weeks past your site's last hard freeze, when light frost has also stopped, before planting out.
What hardiness zone is Wimmera Ryegrass grown in across Georgia?
Georgia spans USDA hardiness zones 7a-9b (USDA ARS PHZM 2023). Wimmera Ryegrass carries a range of zones 5-10, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Georgia site have?
A typical Georgia site sees ~275 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Wimmera Ryegrass needs 70+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Wimmera Ryegrass native to Georgia?
No — the USDA PLANTS Database lists Wimmera Ryegrass as introduced rather than native in the Lower 48, so it is not part of Georgia's native flora. It grows here as a garden plant; pairing it with a few Georgia natives keeps local pollinators fed too.
How should I amend the soil for Wimmera Ryegrass in Georgia?
Wimmera Ryegrass prefers pH 6-8 and well (dry spells) drainage (FAO ECOCROP). That sits in the common-ground band across Georgia soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Wimmera Ryegrass actually grow on my specific land in Georgia?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores wimmera ryegrass 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 Georgia
State-level data is a sketch. Your Growable Ground report scores wimmera ryegrass against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Georgia wimmera ryegrass averages can't show:
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