Campbellsport, Wisconsin, sits in USDA hardiness zone 5a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, cranberry, lavender, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Campbellsport, 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 Campbellsport 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 Campbellsport — soil, climate, flood, and parcel records. How we handle your address.
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Campbellsport — the short answer
Campbellsport, Wisconsin: USDA zone 5a, about 178 days between hard freezes, across 874 acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 21
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~178
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 874 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 5a is Campbellsport's average, not your lot's — a low corner or a tree line moves it. Against Campbellsport's 178-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Campbellsport
Each reading below is measured for Campbellsport itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCampbellsport runs about 178 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
MeasuredCampbellsport sits in USDA hardiness zone 5a.
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 Campbellsport is in
Campbellsport sits in the Southeastern Wisconsin Till Plains — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Campbellsport's own centroid rather than borrowed from Fond du Lac County.
What Grows in Campbellsport
Every plant below cleared Campbellsport's own zone 5a and its 178-day season. Each card opens that plant's Wisconsin profile. How we score.
Is it too late to plant in Campbellsport?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 24; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 21 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 16 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Campbellsport
Closest first, within ~10 miles of Campbellsport. Listing isn't leaking, and distance isn't exposure.
- ENGELMANN REPAIRUnderground Storage Tanks · 250 ft
- FL-13/19E/18-0125Nitrate · 500 ft
- CAMPBELLSPORT VILLAGE HALLUnderground Storage Tanks · 550 ft
- WDOT RIGHT OF WAYUnderground Storage Tanks · 700 ft
- ALLEN BAUMANUnderground Storage Tanks · 950 ft
- TIMON PERRONUnderground Storage Tanks · 1000 ft
- SCHILL MOTOR INCUnderground Storage Tanks · 1100 ft
- ROBERT ZELLERUnderground Storage Tanks · 1100 ft
- KETTLE MORAINE STATE FORESTUnderground Storage Tanks · 1100 ft
- Ice Age Sport ShopUnderground Storage Tanks · 1100 ft
- Philip L BarthUnderground Storage Tanks · 1100 ft
- DUNDEE SAND & GRAVELUnderground Storage Tanks · 1100 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Campbellsport'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 Campbellsport.
Total Sites
343
within ~10 miles of Campbellsport
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Campbellsport
Severity Distribution
within ~10 miles of Campbellsport
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Campbellsport, two things run higher than the national average within ~10 miles of Campbellsport — CAFO (6 sites) and Underground Storage Tanks (212 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Campbellsport
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 Campbellsport average
Your land is one point inside Campbellsport
Everything above resolves to Campbellsport as a whole — one PHZM band and one 28°F frost record, read across 874 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 Campbellsport Average
Campbellsport Average
- ●USDA Zones 5a, averaged across Campbellsport
- ●One soil character for all of Campbellsport
- ●Frost dates read at Campbellsport's scale: Apr 21 to Oct 16
YOUR Parcel
- ✓Your exact zone, not Campbellsport's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Campbellsport
Pull a site-specific report for your exact address in Campbellsport, Wisconsin — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Campbellsport averages can't show:
We read public map data around Campbellsport — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Campbellsport average
How we know this about Campbellsport
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 Campbellsport’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 Campbellsport
When does frost risk typically end in Campbellsport?
The last hard freeze (28°F) in Campbellsport typically lands around Apr 21, 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 12.
When is the first frost in Campbellsport?
The first hard freeze (28°F) in Campbellsport typically arrives around Oct 16, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 2, so the watching starts about Sep 16 — about 178 days after the spring freeze cleared.
How long is the growing season in Campbellsport?
Measured between 28°F hard freezes, Campbellsport sees about 178 frost-free days — roughly Apr 21 through Oct 16, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 12 to Oct 2, about 143 days.
Is the soil safe to grow vegetables in Campbellsport?
The federal record around Campbellsport is a meaningful one — 343 documented sites, mostly Underground Storage Tanks entries (212), the nearest Underground Storage Tanks record under a tenth of a mile out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Campbellsport?
From about Sep 16 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 16 (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 16. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Campbellsport's scale — its 5a band and its 178-day season. Your yard writes its own version of Campbellsport'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 Campbellsport’s own scale
6 of the readings below were taken at Campbellsport's own scale — its own ~178-day season between 28°F freezes, the 874 acres it covers and 343 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Campbellsport's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Campbellsport's own 28°F hard-freeze dates, about Apr 21 and Oct 16 and the ~178-day span between themNOAA 1991–2020 Climate Normals
- 343 documented contamination sites on the federal record near Campbellsport, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Campbellsport's boundary and the 874 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~178-day seasonGrowable Ground crop-matching engine
- The ecoregion at Campbellsport's own centroid, the Southeastern Wisconsin Till PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Campbellsport's 874 acres read through its county's SSURGO summaryfrom Fond du Lac County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Fond du Lac 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 Fond du Lac County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Campbellsport's 874 acreswhy one lot differs from the next →
- Which side of Campbellsport you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 874 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Campbellsport-wide figureread your own land →
More in Wisconsin
Wider growing context
What grows across WisconsinCampbellsport sits outside our named growing regions, so Wisconsin as a whole is its closest context here.
Nearby growing guides