Horseradish is grown for its root, ready to pull about 150 days after sowing. It's hardy across USDA zones 3 through 9 and stands up to deer. Its flowers are a modest draw for honeybees and native bees, even though the root is the prize. As a brassica (the cabbage family), 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.
Horseradish — the short answer
Horseradish: grown in zones 3–9, full sun, pH 4.5–8.7, about 150 days to maturity.
- USDA zones
- 3–9
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- Soil pH
- 4.5–8.7
- FAO ECOCROP
- Sun
- Full Sun
- Growable Ground Plant Database
- Days to Maturity
- 150 days
- Growable Ground Plant Database
- Frost-kill temperature
- 30.2°F
- FAO ECOCROP
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.
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Zone averages can't see the slope, soil, frost, and sun that decide whether horseradish actually takes — and those shift from one yard to the next. Enter your address and we'll score horseradish against your land's real conditions.
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What Horseradish is
Horseradish reaches around 2.5 feet at maturity. It's also deer-resistant.
How to grow Horseradish
Horseradish grows in USDA zones 3 through 9 and is ready to harvest about 150 days after planting. Horseradish does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4.5 to 8.7, on evenly moist to well-drained ground. It needs around 1,200 growing degree days to mature and a growing season of at least 150 frost-free days, which is why climate matters as much as soil.
USDA Zones
3-9
USDA PHZM 2023
Soil pH
4.5 - 8.7
FAO ECOCROP
Sun
Full Sun
Growable Ground plant catalog
Drainage
poorly (saturated >50% of year), well (dry spells)
Growable Ground plant catalog
Frost Kill Temperature
30.2°F
Where cold starts killing growing tissue. Not a winter-survival floor — a dormant perennial takes far colder, which its hardiness zone answers.
FAO ECOCROP
Minimum Growing Temperature
42.8°F
Below this it stops growing rather than dies — a pace limit, not a survival limit.
FAO ECOCROP
Days to Maturity
150 days
Growable Ground plant catalog
GDD Required
1200+
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
2.5 ft
Growable Ground plant catalog
Frost-Free Days
150+
The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.
Growable Ground plant catalog
Sow directly
Sow horseradish seed straight into the bed — root crops germinate fast and resent transplanting. Give them full sun.
Match the soil
Horseradish prefers pH 4.5 to 8.7 (FAO ECOCROP). 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
Horseradish is ready about 150 days after sowing. Pull while roots are young and tender — sweeter than oversized ones.
Where Horseradish thrives
Horseradish is hardy across USDA zones 3 through 9. 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 3–9 spans average winter lows from -40°F to 30°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 42 outright and splits 9 more down the middle — and which side of that line your land sits on changes the answer.
Zones 3–9·Where Horseradish growsOpen map →
Where Horseradish stands, state by state
Horseradish is rated for zones 3–9 — a cold floor USDA puts at -40 to -30°F. Across the 50 states and DC, 42 sit fully inside that band, the line runs through 9 more, and 0 sit outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 3–9
42 states
3 of 42 shown
The line runs through
9 states
- Alaska · zones 1a-9a
- California · zones 4b-11a
- Nevada · zones 4a-10a
3 of 9 shown
Horseradish’s band covers part of each of these states — which side of the line your county sits on changes the answer, and each state page draws it.
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 Horseradish
Growing guides for horseradish
In rotation planning, horseradish counts as a Brassica — beds recover best when brassica 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
Good news for pet owners — horseradish isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Horseradish offers low value to bees and other pollinators.
Before you harvest horseradish, 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 horseradish for food. Our free screen reads 9 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 Horseradish'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 Horseradish will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether horseradish 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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How we know this about Horseradish
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•USDA PHZM•ASPCA
Frequently asked questions
Can I grow Horseradish in my zone?
Horseradish grows in USDA hardiness zones 3 through 9 (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 Horseradish take to grow?
Horseradish is ready to harvest about 150 days after planting. Your local frost dates and soil temperature move that window earlier or later.
When should you plant Horseradish?
Horseradish is a cool-season crop, so it goes in during the cool halves of the year — early spring, and again in late summer for a fall planting — rather than at the height of summer heat. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Horseradish need?
Horseradish 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 Horseradish need?
Horseradish prefers soil pH 4.5 to 8.7, on evenly moist to well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Horseradish attract pollinators?
Yes — horseradish's flowers are a modest nectar source for honeybees and native bees.
Is Horseradish safe for pets?
Horseradish is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)