Shell Lake, Wisconsin, sits in USDA hardiness zone 4a — a zone band wide enough that plant choice, not possibility, is the interesting question.
The conditions favor cabbage, cranberry, turkish rocket, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Shell Lake, 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 Shell Lake 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 Shell Lake — soil, climate, flood, and parcel records. How we handle your address.
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Shell Lake — the short answer
Shell Lake, Wisconsin: USDA zone 4a, about 160 days between hard freezes, across 4K acres of city.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~160
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 4K 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 4a is Shell Lake's average, not your lot's — a low corner or a tree line moves it. Against Shell Lake's 160-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Shell Lake
Each reading below is measured for Shell Lake itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredShell Lake runs about 160 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
MeasuredShell Lake sits in USDA hardiness zone 4a.
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 Shell Lake is in
Shell Lake sits in the North Central Hardwood Forests — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Shell Lake's own centroid, and it is not what its county reads: Washburn County is mostly Northern Lakes and Forests. The wider page above you is answering a different question about different ground.
What Grows in Shell Lake
Every plant below cleared Shell Lake's own zone 4a and its 160-day season. Each card opens that plant's Wisconsin profile. How we score.
Is it too late to plant in Shell Lake?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Apr 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 9 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
What's on the federal record near Shell Lake
Closest first, within ~10 miles of Shell Lake. Listing isn't leaking, and distance isn't exposure.
- SHELL LAKE AIRPORTUnderground Storage Tanks · 2000 ft
- DNR SHELL LAKE AIRPORT HANGARUnderground Storage Tanks · 2200 ft
- LAKE POINT AERO CLUBUnderground Storage Tanks · 0.5 mi
- SHELL LAKE MUNICIPAL AIRPORTUnderground Storage Tanks · 0.6 mi
- SCHOOL DISTRICT OF SHELL LAKEUnderground Storage Tanks · 1.0 mi
- BEAVER HOLDINGS INC DBA SHELL LAKE WOODCRAFTERSBrownfields · 1.0 mi
- MIKE ROBERTS FARM EQUIPBrownfields · 1.1 mi
- Shell Lake Travel CenterUnderground Storage Tanks · 1.1 mi
- WASHBURN COUNTY SHERIFFS DEPTUnderground Storage Tanks · 1.2 mi
- WASHBURN CNTY CLEANSWEEPBrownfields · 1.3 mi
- Express MartUnderground Storage Tanks · 1.3 mi
- CITY OF SHELL LAKEUnderground Storage Tanks · 1.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Shell Lake'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 Shell Lake.
Total Sites
174
within ~10 miles of Shell Lake
Risk Level
Moderate
Highest-severity
2 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Shell Lake
Severity Distribution
within ~10 miles of Shell Lake
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Shell Lake
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 Shell Lake average
Your land is one point inside Shell Lake
Everything above resolves to Shell Lake as a whole — one PHZM band and one 28°F frost record, read across 4K 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 city 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 Shell Lake Average
Shell Lake Average
- ●USDA Zones 4a, averaged across Shell Lake
- ●One soil character for all of Shell Lake
- ●Frost dates read at Shell Lake's scale: May 2 to Oct 9
YOUR Parcel
- ✓Your exact zone, not Shell Lake's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Shell Lake
Pull a site-specific report for your exact address in Shell Lake, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Shell Lake averages can't show:
We read public map data around Shell Lake — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Shell Lake average
How we know this about Shell Lake
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Shell Lake’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 city grain anywhere on this page — there is no city-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 Shell Lake
When does frost risk typically end in Shell Lake?
The last hard freeze (28°F) in Shell Lake typically lands around May 2, 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 23.
When is the first frost in Shell Lake?
The first hard freeze (28°F) in Shell Lake typically arrives around Oct 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 25, so the watching starts about Sep 9 — about 160 days after the spring freeze cleared.
How long is the growing season in Shell Lake?
Measured between 28°F hard freezes, Shell Lake sees about 160 frost-free days — roughly May 2 through Oct 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 23 to Sep 25, about 125 days.
Is the soil safe to grow vegetables in Shell Lake?
The federal record around Shell Lake shows 174 documented sites, mostly Underground Storage Tanks entries (100), the nearest Underground Storage Tanks record about 0.4 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 Shell Lake?
From about Sep 9 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 9 (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 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Shell Lake's scale — its 4a band and its 160-day season. Your yard writes its own version of Shell Lake'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 Shell Lake’s own scale
6 of the readings below were taken at Shell Lake's own scale — its own ~160-day season between 28°F freezes, the 3,741 acres it covers and 174 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Shell Lake's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Shell Lake's own 28°F hard-freeze dates, about May 2 and Oct 9 and the ~160-day span between themNOAA 1991–2020 Climate Normals
- 174 documented contamination sites on the federal record near Shell Lake, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Shell Lake's boundary and the 3,741 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~160-day seasonGrowable Ground crop-matching engine
- Shell Lake sits in the North Central Hardwood Forests — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Shell Lake's 3,741 acres read through its county's SSURGO summaryfrom Washburn County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Washburn 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 Washburn County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Shell Lake's 3,741 acreswhy one lot differs from the next →
- Which side of Shell Lake you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,741 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Shell Lake-wide figureread your own land →
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