Rhubarb is grown for the harvest, ready about two years after sowing. It's hardy across USDA zones 2 through 8 and stands up to deer.
Zones
2-8
pH Range
5.3-7.8
Sun
Full Sun
To First Harvest
~2 yr
Score Rhubarb on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether rhubarb actually takes — and those shift from one yard to the next. Enter your address and we'll score rhubarb against your land's real conditions.
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What Rhubarb is
Rhubarb reaches around three feet at maturity. It's also deer-resistant.
How to grow Rhubarb
Rhubarb grows in USDA zones 2 through 8 and is ready to harvest about two years after planting. Rhubarb does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.3 to 7.8, on well-drained ground. It needs around 800 growing degree days to mature and a growing season of at least 60 frost-free days, which is why climate matters as much as soil.
USDA Zones
2-8
USDA PHZM 2023
Soil pH
5.3 - 7.8
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
41°F
plant_species_v5.csv
To First Harvest
~2 years
Rhubarb; perennial. Crown division typical (no seed-start). 2-year establishment before harvest.
UMass-Veg; PrairieMoon
GDD Required
800+
plant_species_v5.csv
Mature Height
3 ft
plant_species_v5.csv
Frost-Free Days
60+
plant_species_v5.csv
Start the season right
Plant rhubarb in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Rhubarb prefers pH 5.3 to 7.8 (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
Rhubarb is ready about two years after sowing (UMass-Veg; PrairieMoon). Watch for cultivar-specific ripeness cues and pick at peak.
Good to know
One caution for pet owners — rhubarb is toxic to dogs and cats (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Rhubarb isn't classified as a notable pollinator plant in our data — pair it with high-value bloomers nearby to feed bees.
Where Rhubarb thrives
Rhubarb is hardy across USDA zones 2 through 8. 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 2–8·Where Rhubarb growsOpen map →
Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.
On USDA hardiness-zone overlap, Rhubarb can grow in these states:
See if Rhubarb will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether rhubarb 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 Rhubarb in my zone?
Rhubarb grows in USDA hardiness zones 2 through 8 (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 Rhubarb take to grow?
Rhubarb is ready to harvest about two years after planting (UMass-Veg; PrairieMoon). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Rhubarb?
Most growers plant rhubarb after the last spring frost, once the soil has warmed, leaving enough of the season for its 60-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 Rhubarb need?
Rhubarb 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 Rhubarb need?
Rhubarb prefers soil pH 5.3 to 7.8, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Rhubarb attract pollinators?
Rhubarb isn't classified as a notable pollinator plant in our data. Pairing it with high-value bloomers nearby keeps bees and butterflies fed.
Is Rhubarb safe for pets?
Rhubarb is toxic to pets (dogs,cats) with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency.