Conditional — Some Areas
rakkyo (zones 5-10) has limited zone overlap with Ohio (5b-6b). Only zones 5-6 in the state are suitable.
Your yard isn't the whole zone.
Ohio spans zones 5b-6b, but your yard has its own microclimate — slope, trees, and low spots shift frost and sun across a single parcel. Enter your address and we'll score rakkyo against your land's actual soil, sun, and frost.
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Zone Comparison
Rakkyo Needs
- USDA Zones: 5-10
- Soil pH: 4.3 - 7.2
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 45+
Ohio Has
- USDA Zones: 5b-6b
- Last Frost: Apr 15 - May 15
- First Frost: Sep 30 - Oct 30
- Annual Rainfall: 34-42 inches
- Common Soils: Glacial till, Clay loam, Silt loam
Plant Zone Range (zones 5-10)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Rakkyo in Ohio
The frost window
Across Ohio, the last spring frost clears between Apr 15 and May 15, and the first fall frost lands between Sep 30 and Oct 30 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 138-day window you can count on — up to 198 days on a mild site in a kind year.
Frost tenderness
Rakkyo is frost-tender — its listed minimum temperature is 46.4°F (USDA PLANTS Database) — so set plants out after the last frost has cleared your local site, not the state's earliest date.
Days to maturity vs. the window
At 150 days to maturity (USDA PLANTS Database), the fit is tight: Ohio's dependable window runs 138 days. Starting seeds indoors and transplanting at the front of the window banks the difference.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Rakkyo wants 45+ frost-free days; a typical Ohio site sees ~190 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Rakkyo needs ~1400 GDD (base 50°F) to ripen. The state median runs ~3200 GDD (USDA NRCS county aggregates), so Ohio's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Rakkyo likes near-neutral soil (pH 4.3-7.2). That's the common-ground band across Ohio's glacial till and clay loam — a soil test confirms it for your site. Drainage matters: this plant wants well (dry spells). If your Ohio site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. Ohio soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Rakkyo in Ohio — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 5-10 (USDA PLANTS Database)
- State Zones: 5b-6b (USDA ARS PHZM 2023)
- Growing Season: Apr 15 - May 15 to Sep 30 - Oct 30 (NOAA Climate Normals)
- Days to Maturity: 150 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Ohio growers also need to think about:
Heavy clay soils across much of northern Ohio require amendment for drainage
A raised bed fixes the drainage in one weekend — and amended clay repays the effort as some of the richest soil there is.
Variable spring weather with late frost risk through mid-May
Watch your local last-frost normal, not the region's — holding tender plants two extra weeks beats replanting a bed.
Japanese beetles and tomato hornworms are common garden pests
Hand-pick early, row-cover young plants, and skip broad sprays — extension IPM guides keep the beneficial insects on your side.
Wet springs can delay planting and promote root rot
Raised or mounded rows shed spring water and warm earlier — where puddles linger, drainage is the first project worth doing.
Pollinator + Wildlife Value
Rakkyo draws pollinators (moderate value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Ohio Cooperative Extension
For Ohio-specific cultivar recommendations, planting calendars, and pest pressure for rakkyo, the canonical source is Ohio State University Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Common Questions About Growing Rakkyo in Ohio
When can I plant Rakkyo in Ohio?
Ohio's last spring frost clears between Apr 15 and May 15, and the first fall frost lands between Sep 30 and Oct 30 (NOAA Climate Normals 1991-2020). Rakkyo is frost-tender — its listed minimum temperature is 46.4°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Rakkyo mature before first frost in Ohio?
It's close: Rakkyo needs 150 days to mature (USDA PLANTS Database) against Ohio's 138-day dependable window (NOAA Climate Normals 1991-2020). Start seeds indoors and transplant right after last frost to bank the missing days.
What hardiness zone is Rakkyo grown in across Ohio?
Ohio spans USDA hardiness zones 5b-6b (USDA ARS PHZM 2023). Rakkyo carries a range of zones 5-10, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Ohio site have?
A typical Ohio site sees ~190 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Rakkyo needs 45+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
How should I amend the soil for Rakkyo in Ohio?
Rakkyo prefers pH 4.3-7.2 and well (dry spells) drainage (USDA PLANTS Database). That sits in the common-ground band across Ohio soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Rakkyo actually grow on my specific land in Ohio?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores rakkyo against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Ohio
State-level data is a sketch. Your Growable Ground report scores rakkyo against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
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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