Guar Bean is an annual grown for the harvest, ready about 90 days after sowing. Season length, not a winter zone, decides where it grows. Notably, it handles dry spells once it's established. Its flowers are a modest draw for honeybees, even though the harvest is the prize. A nitrogen-fixer, it draws nitrogen from the air and feeds it back to the soil — turn it under or leave the roots in place, and the next planting inherits a richer bed.
Guar Bean — the short answer
Guar Bean: grown in zones 8–12, full sun, pH 5.5–8.5, about 90 days to maturity.
- USDA zones
- Grown as an annual — see the growing season
- Growing season, not a hardiness zone
- Soil pH
- 5.5–8.5
- FAO ECOCROP
- Sun
- Full Sun
- Growable Ground Plant Database
- Days to Maturity
- 90 days
- Growable Ground Plant Database
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 Guar Bean on your exact land.
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What Guar Bean is
Guar Bean grows as an annual and reaches around four feet at maturity.
How to grow Guar Bean
Season length, not a winter zone, decides where guar bean grows; it is ready to harvest about 90 days after planting. Guar Bean does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 8.5, on well-drained ground. It needs around 2,500 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
5.5 - 8.5
FAO ECOCROP
Sun
Full Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Minimum Growing Temperature
50°F
Below this it stops growing rather than dies — a pace limit, not a survival limit.
FAO ECOCROP
Days to Maturity
90 days
Growable Ground plant catalog
GDD Required
2500+
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
4 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 guar bean in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Guar Bean prefers pH 5.5 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. It fixes its own nitrogen, so skip the high-nitrogen feed and instead dust the seed with a matching rhizobium inoculant at sowing.
Water while it roots in
Water deeply while guar bean establishes, letting the soil dry between soakings; once its roots are in, it rides out dry spells on its own.
Harvest at maturity
Guar Bean is ready about 90 days after sowing. Watch for cultivar-specific ripeness cues and pick at peak.
Where Guar Bean thrives
Season length, not a winter zone, decides where guar bean 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 8–12 spans average winter lows from 10°F to 60°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 2 outright and splits 26 more down the middle.
Zones 8–12·Hardiness bandOpen map →
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 Guar Bean stands, state by state
Guar Bean is rated for zones 8–12 — a cold floor USDA puts at 10 to 20°F. Across the 50 states and DC, 2 sit fully inside that band, the line runs through 26 more, and 23 sit outside it — and inside every split state, the same line runs on at county grain.
The line runs through
26 states
- Alaska · zones 1a-9a
- Idaho · zones 3b-8a
- California · zones 4b-11a
3 of 26 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 Guar Bean
Growing guides for guar bean
In rotation planning, guar bean counts as a Legume — beds recover best when legume 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
Guar Bean offers low value to bees and other pollinators.
Before you harvest guar bean, 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 guar bean 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 Guar Bean'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 Guar Bean will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether guar bean 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 Guar Bean
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 Guar Bean in my zone?
Guar Bean 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 Guar Bean take to grow?
Guar Bean is ready to harvest about 90 days after planting. Your local frost dates and soil temperature move that window earlier or later.
When should you plant Guar Bean?
Most growers plant guar bean 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 Guar Bean need?
Guar Bean 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 Guar Bean need?
Guar Bean prefers soil pH 5.5 to 8.5, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Guar Bean attract pollinators?
Yes — guar bean's flowers are a modest nectar source for honeybees.
Keep exploring Guar Bean
Guar Bean state by state
Every state guar bean's zone reaches — 11 link straight to that state's guar bean growing page; the rest open the state's full growing guide.