Grain Sorghum is an annual grown for the harvest, ready about 110 days after sowing. It's hardy across USDA zones 2 through 11 and 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.
Zones
2-11
pH Range
5-8.5
Sun
Full Sun
Days to Maturity
110
Score Grain Sorghum on your exact land.
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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
Grain Sorghum grows in USDA zones 2 through 11 and 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
2-11
USDA PHZM 2023
Soil pH
5 - 8.5
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
46.4°F
plant_species_v5.csv
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+
plant_species_v5.csv
Mature Height
5 ft
plant_species_v5.csv
Frost-Free Days
90+
plant_species_v5.csv
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 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
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.
Good to know
One caution for pet owners — grain sorghum is toxic to dogs and cats and horses (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Grain Sorghum isn't classified as a notable pollinator plant in our data — pair it with high-value bloomers nearby to feed bees.
Where Grain Sorghum thrives
On hardiness alone, grain sorghum grows across most of the country — its range (USDA zones 2 through 11) is unusually wide. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 2–11·Where Grain Sorghum growsOpen map →
Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.
On USDA hardiness-zone overlap, Grain Sorghum can grow in these states:
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.
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Frequently Asked Questions
Can I grow Grain Sorghum in my zone?
Grain Sorghum grows in USDA hardiness zones 2 through 11 (USDA PHZM 2023). Zone is one factor — 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 (USDA PLANTS Database). 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 pets (dogs,cats,horses) with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency.