Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 54836 — Foxboro, WI

ZIP code 54836 (Foxboro, Douglas County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is June 1 and the first fall frost September 22.

Where ZIP 54836 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone4a−30 to −25 °F

Coldest night−34.4 to −31.7 °C

Last frostJun 1

First frostSep 22

2012 zone4a

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 4a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Foxboro, WI…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Foxboro, WI

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostJune 1median — 50% chance of a later frost

Safe for tender plantsJune 14only 10% chance of frost after

First fall frostSeptember 22median — 10% chance by Sep 8

Growing season113 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 20 and returns around October 2.

From the NOAA station Foxboro, WI — 5 miles away, elevation 932 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 54836

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 20 – May 4

SpinachSow outdoors · Apr 20 – May 11

Broccoli, cabbageStart indoors · Mar 23 – Apr 6

Broccoli, cabbageTransplant · May 11 – May 25

Onion setsPlant outdoors · May 4 – May 18

PotatoesPlant outdoors · May 11 – May 25

LettuceSow outdoors · May 4 – May 18

Carrots, beetsSow outdoors · May 11 – May 25

TomatoesStart indoors · Apr 6 – Apr 20

TomatoesTransplant · Jun 8 – Jun 22

Peppers, eggplantStart indoors · Mar 23 – Apr 6

Peppers, eggplantTransplant · Jun 15 – Jun 29

BeansSow outdoors · Jun 8 – Jun 22

Sweet cornSow outdoors · Jun 8 – Jun 22

Cucumbers, squashSow outdoors · Jun 8 – Jun 22

Fall lettuce, spinachSow outdoors · Jul 28 – Aug 11

GarlicPlant cloves · Sep 8 – Oct 13

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 1) and first fall frost (Sep 22) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 54836 came on Apr 30 — 4 days later than the 1991–2020 average (Apr 26).

average
Apr 262026
Apr 30

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 4a in Wisconsin

419 plants native to the lower 48 states, recorded in Wisconsin, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. Each links to its USDA PLANTS profile.

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Foxboro, WI.

Soil in Foxboro, WI

The soil mapped at the center of ZIP 54836 is Newood — sandy loam, moderately well drained.

TextureSandy loamdrains and warms fast; dries out and needs more feeding

pH5.9moderately acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter2%moderate

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Newood-Pesabic-Capitola complex, 0 to 15 percent slopes, very stony.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 54836; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Foxboro, WI

Summer high78 °Faverage high, July

Winter low0 °Faverage low, January

Hot days4days a year at 90 °F or more

Freezing nights189nights a year at 32 °F or less

Growing degree days1,610base 50 °F — the season’s usable heat

Longest day15 h 49 mindaylight on June 21

Shortest day8 h 35 mindaylight on December 21

Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)

Precipitation35.7 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Foxboro, WI (5 mi away); precipitation: Superior 14.8 S, WI (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

4 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

548804b

Superior, WI · 10 mi

557974a

Wrenshall, MN · 11 mi

557494a

Holyoke, MN · 12 mi

548744b

South Range, WI · 15 mi

548424a

Hawthorne, WI · 16 mi

Wisconsin planting zones →

Questions about 54836

What planting zone is ZIP code 54836?

ZIP code 54836 (Foxboro, WI) is in USDA hardiness zone 4a on the 2023 map: the coldest night of an average winter reaches −30 to −25 °F (−34.4 to −31.7 °C).

When is the last frost in Foxboro, WI?

The median last spring frost (32 °F) near 54836 is June 1; after June 14 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Foxboro station.

When is the first frost in Foxboro, WI?

The median first fall frost near 54836 is September 22, giving a median frost-free growing season of 113 days.

When should I plant tomatoes in 54836?

Start tomato seeds indoors around Apr 6 – Apr 20 and set transplants outside around Jun 8 – Jun 22, one to three weeks after the median last frost.

How much rain and snow does 54836 get?

About 35.7 inches of precipitation a year (NOAA 1991–2020 normals, Superior 14.8 S station).

How hot do summers get in Foxboro, WI?

The average high peaks at 78 °F in July, with about 4 days a year at 90 °F or more.

What kind of soil does 54836 have?

The USDA soil survey maps Newood at the center of ZIP 54836: sandy loam, moderately well drained, pH about 5.9 (moderately acidic).

Did spring come early in Foxboro, WI in 2026?

Spring leaf-out near 54836 came on Apr 30 in 2026, 4 days later than the 1991–2020 average (Apr 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Foxboro, WI?

Long-day onions: the longest day near 54836 is 15 h 49 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).