Conditional — Some Areas
rice (zones 5-12) has limited zone overlap with Delaware (7a-7b). Only zones 7-7 in the state are suitable.
Your yard isn't the whole zone.
Rice is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is, and slope, trees, and low spots move the last-frost date across a single yard. Enter your address and we'll score rice against your parcel's actual frost dates, sun, and soil.
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Zone Comparison
Rice Needs
- USDA Zones: 5-12
- Soil pH: 4.5 - 9
- Sun: Full Sun
- Drainage: poorly (saturated >50% of year)
- Frost-Free Days: 80+
Delaware Has
- USDA Zones: 7a-7b
- Last Frost: Apr 1 - Apr 20
- First Frost: Oct 15 - Nov 5
- Annual Rainfall: 42-48 inches
- Common Soils: Sandy loam, Silt loam, Tidal marsh
Plant Zone Range (zones 5-12)
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 Rice in Delaware
The frost window
Across Delaware, the last spring frost clears between Apr 1 and Apr 20, and the first fall frost lands between Oct 15 and Nov 5 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 178-day window you can count on — up to 218 days on a mild site in a kind year.
Frost tenderness
Rice is frost-tender — its listed minimum temperature is 50°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 120 days to maturity (USDA PLANTS Database), a planting right after last frost ripens with 58 days to spare even in Delaware's tightest frost scenario — room for a later start or a second sowing.
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
Rice wants 80+ frost-free days; a typical Delaware site sees ~190 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Rice needs ~2500 GDD (base 50°F) to ripen. The state median runs ~3500 GDD (USDA NRCS county aggregates), so Delaware'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
Rice likes near-neutral soil (pH 4.5-9). That's the common-ground band across Delaware's sandy loam and silt loam — a soil test confirms it for your site. Drainage requirement: poorly (saturated >50% of year). A soil-survey lookup (NRCS SSURGO) flags whether your specific site matches.
Plant pH and drainage requirements from USDA PLANTS Database. Delaware soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Rice in Delaware — Quick Answer
- Verdict: Conditional — Some Areas
- Plant Zones: 5-12 (USDA PLANTS Database)
- State Zones: 7a-7b (USDA ARS PHZM 2023)
- Growing Season: Apr 1 - Apr 20 to Oct 15 - Nov 5 (NOAA Climate Normals)
- Days to Maturity: 120 days
What Else to Consider
Zone compatibility tells you about winter cold survival — but Delaware growers also need to think about:
Sandy soils in southern DE drain too quickly
Organic matter is the fix, applied annually — compost and cover crops teach sandy ground to hold water and nutrients.
Salt spray damage near the coast
Salt-tolerant species up front and a windbreak line behind — a layered coastal defense that catches the spray.
Rising water tables in low-lying areas
Where the water table rises, grow up: mounded rows and raised beds keep roots out of saturated ground.
Delaware Cooperative Extension
For Delaware-specific cultivar recommendations, planting calendars, and pest pressure for rice, the canonical source is University of Delaware Cooperative Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Rice native to Delaware?
No — the USDA PLANTS Database lists Rice as introduced rather than native in the Lower 48, so it is not part of Delaware's native flora. It grows here as a garden plant; pairing it with a few Delaware natives keeps local pollinators fed too.
Looking for plants that belong here? The Delaware growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Rice in Delaware
When can I plant Rice in Delaware?
Delaware's last spring frost clears between Apr 1 and Apr 20, and the first fall frost lands between Oct 15 and Nov 5 (NOAA Climate Normals 1991-2020). Rice is frost-tender — its listed minimum temperature is 50°F (USDA PLANTS Database) — so wait until the last frost has cleared your specific site before planting out.
Can Rice mature before first frost in Delaware?
Yes — Rice matures in 120 days (USDA PLANTS Database), and Delaware's dependable frost-free window runs 178 days (NOAA Climate Normals 1991-2020), leaving 58 days of margin. Plant just after last frost and it ripens ahead of the first fall frost.
What hardiness zone is Rice grown in across Delaware?
Delaware spans USDA hardiness zones 7a-7b (USDA ARS PHZM 2023). Rice carries a range of zones 5-12, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Delaware site have?
A typical Delaware site sees ~190 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Rice needs 80+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Rice native to Delaware?
No — the USDA PLANTS Database lists Rice as introduced rather than native in the Lower 48, so it is not part of Delaware's native flora. It grows here as a garden plant; pairing it with a few Delaware natives keeps local pollinators fed too.
How should I amend the soil for Rice in Delaware?
Rice prefers pH 4.5-9 and poorly (saturated >50% of year) drainage (USDA PLANTS Database). That sits in the common-ground band across Delaware soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Rice actually grow on my specific land in Delaware?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores rice 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 Delaware
State-level data is a sketch. Your Growable Ground report scores rice 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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