The Northwoods (Northern Wisconsin) spans USDA hardiness zones 4a-4b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Wisconsin's coldest, shortest-season tier: the interior forest counties sit at hardiness zones 4a-4b with only 140-158 frost-free days (Florence 140, Sawyer 142, Vilas 143) — roughly two months shorter than the Milwaukee lakeshore. On glaciated northern soils where winter lows reach the -30F floor of zone 4a, Northwoods growers can't inherit the state page's averaged planting dates, variety lists, or perennial ratings — the short interior season sets a different rulebook than the driftless coulees or the lake-warmed Door peninsula to the south. A short list that earns its place here — cranberry, potato, cherry, and sugar maple — with any one site's soil, sun, and drainage making the final cut.
The Northwoods (Northern Wisconsin) spans Wisconsin.
Your yard isn't all of the Northwoods (Northern Wisconsin).
The Northwoods (Northern Wisconsin) spans USDA zones 4a-4b, but your parcel sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 Northwoods (Northern Wisconsin) — soil, climate, flood, and parcel records. How we handle your address.
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The Northwoods (Northern Wisconsin) — the short answer
The Northwoods (Northern Wisconsin): USDA zones 4a-4b, 140–158 frost-free days, in Wisconsin.
- USDA zones
- 4a-4b
- USDA PHZM 2023, aggregated over the footprint
- Frost-free season
- 140–158 days
- NOAA Regional Climate Centers ACIS, 1991-2020
- Counties
- 14
- US Census TIGER/Line 2025
- Region type
- County cluster
- Growable Ground growing-region registry
Region boundary: Growable Ground growing-region registry — curated county clusters, EPA Level III ecoregions, and town clusters drawn finer than any county. Where a region publishes no measured season, no season figure is shown.
Hardiness Zone Range
What Grows in the Northwoods (Northern Wisconsin)
Plants matched to the Northwoods (Northern Wisconsin)'s USDA zones 4a-4b, ordered by how much hardiness margin each has across the region — the ones with room to spare at both ends of this band lead. Each links to its full growing profile.
Native Plants of the Northwoods (Northern Wisconsin)
Plants the USDA PLANTS Database documents as native and present in this region’s state, kept only where the published hardiness range meets the Northwoods (Northern Wisconsin)’s USDA zones 4a-4b — closest range match first. Presence is recorded by state, so a plant can be documented across the state and still be scarce in your corner of the region.
The ground across the Northwoods (Northern Wisconsin)
The USDA soil survey maps this ground county by county. These are those records weighted by land area across 14 member counties — this region’s own profile, not a state figure.
The ground is predominantly Spodosols, at 42% of mapped acres, followed by Alfisols (29%), Histosols (18%) and Entisols (8%). Six soil orders appear somewhere inside the footprint, which is the honest reason a regional soil answer only goes so far. The most extensive named soils are Magnor, Pence, and Padus.
24% of those acres are moderately well drained, and another 19% very poorly drained, 19% well drained. Topsoil pH runs 4.2–5.9 between the lowest and the highest county on record. 12% of the footprint is classed prime farmland.
Soil order
Spodosols
Drainage
Moderately well drained
Topsoil pH
4.2–5.9
Hydric soils
24%
Soil changes across a driveway, so which of these your own ground sits on is a parcel question rather than a regional one. Iron County holds the most wetland ground here, at 35% — soil types explained.
USDA NRCS SSURGO via Soil Data Access
What this means for growing in the Northwoods (Northern Wisconsin)
The soil survey reads this ground county by county, and the readings above are those records summed across the Northwoods (Northern Wisconsin). Here is what they mean for a garden here — and the move an experienced grower makes about each one.
Drainage
From county records24% of the mapped acres across the Northwoods (Northern Wisconsin) are moderately well drained — roughly the middle of the drainage range. That is area-weighted across all 14 of its mapped counties.
This is close to the middle most vegetables prefer: it holds enough water to carry a crop between rains without staying waterlogged. The catch is that a wet spring or a low corner can still tip it soggy.
Plant on the site as-is for most crops, but keep the lowest, slowest-draining beds for moisture-tolerant plantings.
USDA NRCS SSURGO
Surface pH
From county recordsTopsoil across the Northwoods (Northern Wisconsin) runs pH 4.2–5.9 — acidic in all 14 of them.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Wet ground
From county recordsAbout 24% of the ground across the Northwoods (Northern Wisconsin) is mapped as hydric — wetland — soil. Iron County carries the most, at 35%.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Safe to Grow Here?
What the federal record shows across the Northwoods (Northern Wisconsin) — and how to grow with it.
Across the Northwoods (Northern Wisconsin)'s 14 counties the federal record holds 5,714 documented sites, mostly Underground Storage Tanks (3,469), Brownfields (1,042) and Nitrate (1,012). The heaviest single county is Douglas County, with 868.
That is a regional count, not a reading of any one lot — proximity to a documented site is information, not a diagnosis. Open the map outlined to the Northwoods (Northern Wisconsin) to see which records sit where you actually grow.
Sources Checked
Summed across the 14 counties in the Northwoods (Northern Wisconsin)
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.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Your land is one point inside the Northwoods (Northern Wisconsin)
Everything above resolves to the Northwoods (Northern Wisconsin) as a whole — a footprint spanning USDA zones 4a-4b. Your parcel sits in exactly one of them. 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 region 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 regional average.
Your Lot vs the Northwoods (Northern Wisconsin) Average
Northwoods (Northern Wisconsin) Average
- ●USDA Zones 4a-4b, averaged across Northwoods (Northern Wisconsin)
- ●One soil character for all of Northwoods (Northern Wisconsin)
- ●State-average frost dates
YOUR Parcel
- ✓Your exact zone, not Northwoods (Northern Wisconsin)'s 4a-4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in the Northwoods (Northern Wisconsin)
Pull a site-specific report for your exact address in the Northwoods (Northern Wisconsin) — soil, sun, drainage, frost risk, contamination, and scored plant recommendations.
Three things about your lot that Northwoods (Northern Wisconsin) averages can't show:
We read public map data around The Northwoods (Northern Wisconsin) — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Northwoods (Northern Wisconsin) average
How we know this about the Northwoods (Northern Wisconsin)
The boundary: a cluster of neighboring counties. Growing regions have no official boundary, so this footprint is our published one, and every figure on this page was measured over the counties inside it rather than borrowed from the state around it.
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, aggregated across the footprint; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each member’s own record; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above; the soil from the USDA NRCS SSURGO survey, read at each member county’s own record and weighted to this footprint by land area. Where a member carries no record of its own, it is absent from the figure rather than filled in.
Common questions about the Northwoods (Northern Wisconsin)
What hardiness zone is the Northwoods (Northern Wisconsin)?
The Northwoods (Northern Wisconsin) spans USDA hardiness zones 4a-4b, aggregated from the USDA Agricultural Research Service Plant Hardiness Zone Map 2023 across the region's counties. Zones reflect average annual extreme minimum temperatures from 1991–2020 data.
How long is the growing season in the Northwoods (Northern Wisconsin)?
Measured between 28°F hard freezes, the Northwoods (Northern Wisconsin)'s counties mostly run 146 to 155 frost-free days, median 151 (NOAA Regional Climate Centers ACIS, 1991–2020, over 14 member counties). That 9-day spread is the honest read — no single season describes 14 counties, and each county guide below carries its own.
When does frost risk end in the Northwoods (Northern Wisconsin)?
Across the Northwoods (Northern Wisconsin), the middle half of member counties see their last 28°F hard freeze between May 4 and May 11 (median May 9), and their first fall freeze between Oct 4 and Oct 6. Those are hard freezes, not the last light frost: tender transplants wait for about May 30, and elevation decides which end of a 7-day spread you garden in.
What grows well in the Northwoods (Northern Wisconsin)?
The Northwoods (Northern Wisconsin)'s conditions suit plants such as Cranberry, Potato, Cherry, Sugar Maple, Ginseng. What actually thrives on any one site still turns on its specific soil, sun, and drainage — we score each plant against the real conditions at your address.
How is the Northwoods (Northern Wisconsin) defined?
The Northwoods (Northern Wisconsin) is defined here as a curated cluster of 14 neighboring counties that share a growing character. Growing regions have no official boundary, so this footprint is our published one — every county in it is named on this page.
Which states does the Northwoods (Northern Wisconsin) cover?
The Northwoods (Northern Wisconsin) spans Wisconsin. Each state's full growing guide is linked on this page.
What other growing regions cover the same states?
Driftless Area, Southeastern Wisconsin Lakeshore (Milwaukee Metro), Central Sands (Central Wisconsin), Bayfield Peninsula Fruit Belt, and Door County share at least one state with the Northwoods (Northern Wisconsin). Growing regions overlap and interlock — a single address can sit inside more than one, which is why the precise read is always the parcel, not the region.
What this page reads at the Northwoods (Northern Wisconsin)’s own scale
6 of the readings below were taken at the Northwoods (Northern Wisconsin)'s own scale — the zone 4a-4b band across its footprint, a median 151-day season across its 14 counties and 5,714 documented federal contamination records across its 14 counties, 868 of them in Douglas County alone; one is borrowed from a wider read, named and linked below.
Measured here
- The USDA hardiness band 4a-4b aggregated across all 14 counties in the footprintUSDA PHZM 2023
- The boundary itself — the 14 counties this region is curated fromGrowable Ground subregion registry
- The growing character that makes this region distinct from the states it crossesGrowable Ground subregion registry
- The 28°F season across the footprint — the middle half of its 14 counties run 146 to 155 frost-free days, median 151NOAA Regional Climate Centers ACIS, 1991-2020
- The federal contamination record over the whole footprint — 5,714 documented federal contamination records across its 14 counties, 868 of them in Douglas County aloneEPA, USGS and USDA federal site records
- The soil order mix across the footprint — 42% Spodosols, topsoil pH 4.2–5.9, area-weighted across its 14 mapped countiesUSDA NRCS SSURGO
Inherited from a wider read
- The candidate plant list — its state's curated sets, merged and filtered to zones 4a-4bfrom Wisconsin
What this page can’t tell you
- Which end of the 9-day range your ground sits at — 146 days at one extreme, 155 at the other, decided mostly by elevationfrost dates explained →
- Which of those soils your own ground sits on — the survey maps them county-wide, and they change across a drivewaysoil types explained →
- The soil pH, drainage, sun hours, and frost pockets on one specific lotwhy one lot differs from the next →
Explore the Northwoods (Northern Wisconsin)
State growing guides
Counties in this region
Other growing regions across Wisconsin
An unglaciated landscape of steep ridges, deep valleys, and spring-fed coulees in the Upper Midwest — a stronghold of diversified small farms and cold-hardy fruit.
Wisconsin's warmest, longest-season corner — and its only zone 6a. Lake Michigan's thermal mass holds the immediate Milwaukee–Racine shore at USDA zone 6a with 216–217 frost-free days (USDA PHZM 2023 + county climate normals), roughly two extra months over the state's northern zone-4 country. The lake buffers spring and fall alike, so a metro or suburban grower here can run warm-season varieties and a planting calendar the statewide "short-season Wisconsin" page never delivers — grading honestly from 6a on the shore to 5b (188–210 frost-free days) across the inland metro and up the Sheboygan–Manitowoc coast. Distinct from Door County's cherry peninsula further north on the same shore.
Central Wisconsin's growing challenge isn't the cold — it's the sand. This is glacial-outwash country: the droughty, fast-draining, low-fertility sand plain left by Glacial Lake Wisconsin, which is why it became the state's irrigated vegetable belt (potatoes, snap beans, sweet corn) and the heart of the nation's #1 cranberry region around Wood and Juneau. At USDA zone 4b–5a your calendar reads mid-range, but the ground behaves nothing like Wisconsin's silt- and clay-loam average — water and nutrients move straight through, so irrigation and organic-matter building matter more here than the frost date. Towns on the sands: Wisconsin Rapids, Stevens Point, Plover, Bancroft.
Wisconsin's improbable orchard coast — the Bayfield peninsula's lakeshore reads 4b-5a with measured seasons to 179 days, Superior's deep water holding fall frost off long enough for the apples, pears, and berries the 4a interior cannot carry.
A Lake Michigan and Green Bay peninsula whose water-moderated climate holds a roughly 201-day frost-free season in USDA zone 5b — about two and a half weeks longer than inland Brown County just to the south.