Dellwood, Wisconsin, sits in USDA hardiness zone 4b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, cranberry, turkish rocket, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Dellwood, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Dellwood lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Dellwood — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Dellwood — the short answer
Dellwood, Wisconsin: USDA zone 4b, about 166 days between hard freezes, across 3K acres of town.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 28
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~166
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 4b is Dellwood's average, not your lot's — a low corner or a tree line moves it. Against Dellwood's 166-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dellwood
Each reading below is measured for Dellwood itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDellwood runs about 166 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredDellwood sits in USDA hardiness zone 4b.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Dellwood is in
Dellwood sits in the North Central Hardwood Forests — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Dellwood's own centroid rather than borrowed from Adams County.
What Grows in Dellwood
Every plant below cleared Dellwood's own zone 4b and its 166-day season. Each card opens that plant's Wisconsin profile. How we score.
Is it too late to plant in Dellwood?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Mar 31; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 28 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 11 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What's on the federal record near Dellwood
Closest first, within ~10 miles of Dellwood. Listing isn't leaking, and distance isn't exposure.
- DELLWOOD STOREUnderground Storage Tanks · 0.7 mi
- Franks HardwareUnderground Storage Tanks · 0.7 mi
- Castle Rock Trading PostUnderground Storage Tanks · 1.3 mi
- MARIES DELLWOOD MINI MARTUnderground Storage Tanks · 1.3 mi
- BAYSIDE MARINAUnderground Storage Tanks · 1.5 mi
- CASTLE ROCK SPORT SHOPBrownfields · 1.8 mi
- Four Seasons Mini MartUnderground Storage Tanks · 1.9 mi
- Edgewater MarineUnderground Storage Tanks · 2.1 mi
- LAURIES COUNTRY NOOKUnderground Storage Tanks · 2.8 mi
- JU-17/03E/01-0086Nitrate · 3.8 mi
- Buckhorn StoreUnderground Storage Tanks · 4.2 mi
- KENS MARINA & CAMPGROUNDUnderground Storage Tanks · 4.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Dellwood's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Dellwood.
Total Sites
173
within ~10 miles of Dellwood
Risk Level
Moderate
Highest-severity
4 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Dellwood
Severity Distribution
within ~10 miles of Dellwood
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Dellwood, Underground Storage Tanks runs higher than the national average — 135 sites within ~10 miles of Dellwood. That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Dellwood
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Dellwood average
Your land is one point inside Dellwood
Everything above resolves to Dellwood as a whole — one PHZM band and one 28°F frost record, read across 3K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Dellwood Average
Dellwood Average
- ●USDA Zones 4b, averaged across Dellwood
- ●One soil character for all of Dellwood
- ●Frost dates read at Dellwood's scale: Apr 28 to Oct 11
YOUR Parcel
- ✓Your exact zone, not Dellwood's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dellwood
Pull a site-specific report for your exact address in Dellwood, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dellwood averages can't show:
We read public map data around Dellwood — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dellwood average
How we know this about Dellwood
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Dellwood’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Dellwood
When does frost risk typically end in Dellwood?
The last hard freeze (28°F) in Dellwood typically lands around Apr 28, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 19.
When is the first frost in Dellwood?
The first hard freeze (28°F) in Dellwood typically arrives around Oct 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 27, so the watching starts about Sep 11 — about 166 days after the spring freeze cleared.
How long is the growing season in Dellwood?
Measured between 28°F hard freezes, Dellwood sees about 166 frost-free days — roughly Apr 28 through Oct 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 19 to Sep 27, about 131 days.
Is the soil safe to grow vegetables in Dellwood?
The federal record around Dellwood shows 173 documented sites, mostly Underground Storage Tanks entries (135), the nearest Underground Storage Tanks record about 0.7 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Dellwood?
From about Sep 11 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 11 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dellwood's scale — its 4b band and its 166-day season. Your yard writes its own version of Dellwood's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Dellwood’s own scale
6 of the readings below were taken at Dellwood's own scale — its own ~166-day season between 28°F freezes, the 3,339 acres it covers and 173 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dellwood's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Dellwood's own 28°F hard-freeze dates, about Apr 28 and Oct 11 and the ~166-day span between themNOAA 1991–2020 Climate Normals
- 173 documented contamination sites on the federal record near Dellwood, the closest Underground Storage Tanks record about 0.7 miles out from the town centreFederal environmental registers
- Dellwood's boundary and the 3,339 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~166-day seasonGrowable Ground crop-matching engine
- The ecoregion at Dellwood's own centroid, the North Central Hardwood ForestsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Dellwood's 3,339 acres read through its county's SSURGO summaryfrom Adams County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Adams County
- The growing challenges every Wisconsin grower plans around — written at state scale, so they stay on the state guidefrom Wisconsin
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Adams County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dellwood's 3,339 acreswhy one lot differs from the next →
- Which side of Dellwood you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,339 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.7 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Dellwood-wide figureread your own land →
More in Wisconsin
Growing region
Nearby growing guides