Grain Sorghum is an annual grown for the harvest, ready about 110 days after sowing. Season length, not a winter zone, decides where it grows. Notably, it handles dry spells once it's established. As a grass, give it a fresh bed each year — away from where its relatives just grew — so the soil-borne pests and diseases of the family never get a foothold.
Grain Sorghum — the short answer
Grain Sorghum: grown in zones 2–11, full sun, pH 5–8.5, about 110 days to maturity.
- USDA zones
- Grown as an annual — see the growing season
- Growing season, not a hardiness zone
- Soil pH
- 5–8.5
- FAO ECOCROP
- Sun
- Full Sun
- Growable Ground Plant Database
- Days to Maturity
- 110 days
- USDA-NRCS; ISU-GDD
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.
Score Grain Sorghum on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether grain sorghum actually takes — and those shift from one yard to the next. Enter your address and we'll score grain sorghum against your land's real conditions.
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What Grain Sorghum is
Grain Sorghum grows as an annual and reaches around five feet at maturity. It blooms yellow in late summer.
How to grow Grain Sorghum
Season length, not a winter zone, decides where grain sorghum grows; it is ready to harvest about 110 days after planting. Grain Sorghum does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5 to 8.5, on well-drained ground. It needs around 2,000 growing degree days to mature and a growing season of at least 90 frost-free days, which is why climate matters as much as soil.
USDA Zones
Grown as an annual — see the growing season
Soil pH
5 - 8.5
FAO ECOCROP
Sun
Full Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Minimum Growing Temperature
46.4°F
Below this it stops growing rather than dies — a pace limit, not a survival limit.
FAO ECOCROP
Days to Maturity
110 days
Grain sorghum; can serve as warm-season cover crop. Days = direct-seed to grain head maturity.
USDA-NRCS; ISU-GDD
GDD Required
2000+
Growing degree-days of accumulated warmth it needs to mature — humid summers reach this faster than cool coastal ones.
Growable Ground plant catalog
Mature Height
5 ft
Growable Ground plant catalog
Frost-Free Days
90+
The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.
Growable Ground plant catalog
Start the season right
Plant grain sorghum in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Grain Sorghum prefers pH 5 to 8.5 (FAO ECOCROP). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water while it roots in
Water deeply while grain sorghum establishes, letting the soil dry between soakings; once its roots are in, it rides out dry spells on its own.
Harvest at maturity
Grain Sorghum is ready about 110 days after sowing (USDA-NRCS; ISU-GDD). Watch for cultivar-specific ripeness cues and pick at peak.
Where Grain Sorghum thrives
Season length, not a winter zone, decides where grain sorghum grows. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 2–11 spans average winter lows from -50°F to 50°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 48 outright and splits 3 more down the middle.
Zones 2–11·Hardiness bandOpen map →
Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.
This map is derived from the USDA ARS / PRISM Plant Hardiness Zone Map (2023) and is not the official USDA Plant Hardiness Zone Map.
Where Grain Sorghum stands, state by state
Grain Sorghum is rated for zones 2–11 — a cold floor USDA puts at -50 to -40°F. Across the 50 states and DC, 48 sit fully inside that band, the line runs through 3 more, and 0 sit outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 2–11
48 states
3 of 48 shown
State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.
What grows around Grain Sorghum
Growing guides for grain sorghum
In rotation planning, grain sorghum counts as a Grass — beds recover best when grass crops don’t follow each other in the same spot year over year. (Growable Ground derivation — crop-rotation group from botanical family)
Related plants in vegetable
Good to know
One caution for pet owners — grain sorghum is toxic to dogs, cats and horses (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)
Grain Sorghum isn't classified as a notable pollinator plant in our data — pair it with high-value bloomers nearby to feed bees.
Before you harvest grain sorghum, know your soil
Anything you grow to eat takes up what's in the ground it grows in, so it's worth knowing what's documented near you before you plant grain sorghum for food. Our free screen reads 8 federal source types across roughly 1.8M indexed sites and shows which sit near your address and which way they drain. It's a screening estimate from public records and proximity — not a soil test — so a nearby record means a soil test is worth it, not that your soil is unsafe.
Your land is one point inside Grain Sorghum's range
This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.
See if Grain Sorghum will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether grain sorghum actually takes — we score it against the real conditions at your address.
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.
25+ data sources analyzed in seconds
How we know this about Grain Sorghum
The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.
Grounded inUSDA PLANTS Database•ASPCA
Frequently asked questions
Can I grow Grain Sorghum in my zone?
Grain Sorghum is grown as an annual, so a hardiness zone does not decide it — its growing season follows your last and first frost dates. Soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
How long does Grain Sorghum take to grow?
Grain Sorghum is ready to harvest about 110 days after planting (USDA-NRCS; ISU-GDD). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Grain Sorghum?
Most growers plant grain sorghum after the last spring frost, once the soil has warmed, leaving enough of the season for its 90-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Grain Sorghum need?
Grain Sorghum needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Grain Sorghum need?
Grain Sorghum prefers soil pH 5 to 8.5, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Grain Sorghum attract pollinators?
Grain Sorghum isn't classified as a notable pollinator plant in our data. Pairing it with high-value bloomers nearby keeps bees and butterflies fed.
Is Grain Sorghum safe for pets?
Grain Sorghum is toxic to dogs, cats and horses with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)
Keep exploring Grain Sorghum
Grain Sorghum state by state
Every state grain sorghum's zone reaches — 35 link straight to that state's grain sorghum growing page; the rest open the state's full growing guide.