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

Planting zone for 54204 — Brussels, WI

ZIP code 54204 (Brussels, Door County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 6 and the first fall frost October 17.

Where ZIP 54204 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.

Zone5b−15 to −10 °F
Coldest night−26.1 to −23.3 °C
Last frostMay 6
First frostOct 17
2012 zone5b

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 5b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Brussels, 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 Brussels, WI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 6median — 50% chance of a later frost
Safe for tender plantsMay 20only 10% chance of frost after
First fall frostOctober 17median — 10% chance by Oct 1
Growing season163 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 23 and returns around November 1.

From the NOAA station Forestville-4e, WI — 11 miles away, elevation 689 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 54204

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 25 – Apr 8
SpinachSow outdoors · Mar 25 – Apr 15
Broccoli, cabbageStart indoors · Feb 25 – Mar 11
Broccoli, cabbageTransplant · Apr 15 – Apr 29
Onion setsPlant outdoors · Apr 8 – Apr 22
PotatoesPlant outdoors · Apr 15 – Apr 29
LettuceSow outdoors · Apr 8 – Apr 22
Carrots, beetsSow outdoors · Apr 15 – Apr 29
TomatoesStart indoors · Mar 11 – Mar 25
TomatoesTransplant · May 13 – May 27
Peppers, eggplantStart indoors · Feb 25 – Mar 11
Peppers, eggplantTransplant · May 20 – Jun 3
BeansSow outdoors · May 13 – May 27
Sweet cornSow outdoors · May 13 – May 27
Cucumbers, squashSow outdoors · May 13 – May 27
Fall lettuce, spinachSow outdoors · Aug 22 – Sep 5
GarlicPlant cloves · Oct 3 – Nov 7
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 6) and first fall frost (Oct 17) 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 54204 came on Apr 22 — about the same time as the 1991–2020 average (Apr 22).

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 5b in Wisconsin

518 plants native to the lower 48 states, recorded in Wisconsin, and rated by the USDA to survive −15 °F or colder — the bottom of zone 5b. Each links to its USDA PLANTS profile.

Trees 49

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican chestnut115 ft · blooms early summer · high shade tolerance · to −33 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °F

Shrubs 93

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °FAllegheny serviceberry35 ft · blooms early spring · low shade tolerance · to −38 °Falternateleaf dogwood25 ft · blooms mid spring · low shade tolerance · to −47 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °F

Wildflowers & perennials 197

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 159

American beachgrass2.5 ft · blooms spring · high shade tolerance · to −28 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 5

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °Fsummer grape30 ft · blooms late spring · low shade tolerance · to −23 °FVirginia creeper1 ft · blooms late spring · medium shade tolerance · to −28 °F

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 Brussels, WI.

Soil in Brussels, WI

The center of ZIP 54204 is mapped as Rock outcrop: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 54204; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Brussels, WI

Summer high77 °Faverage high, July
Winter low11 °Faverage low, January
Hot days1days a year at 90 °F or more
Freezing nights148nights a year at 32 °F or less
Growing degree days1,976base 50 °F — the season’s usable heat
Longest day15 h 35 mindaylight on June 21
Shortest day8 h 48 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation30.1 inper year, rain and melted snow
Snowfall53 inper year; 91 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 26 °F, low 11 °F 26°11° JanFebruary: average high 29 °F, low 13 °F 29°13° FebMarch: average high 38 °F, low 22 °F 38°22° MarApril: average high 49 °F, low 33 °F 49°33° AprMay: average high 61 °F, low 43 °F 61°43° MayJune: average high 71 °F, low 53 °F 71°53° JunJuly: average high 77 °F, low 59 °F 77°59° JulAugust: average high 76 °F, low 59 °F 76°59° AugSeptember: average high 69 °F, low 51 °F 69°51° SepOctober: average high 56 °F, low 40 °F 56°40° OctNovember: average high 43 °F, low 29 °F 43°29° NovDecember: average high 32 °F, low 19 °F 32°19° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 1.45 in precipitation, 12.4 in snowfall 1.4❄12 JanFebruary: 1.01 in precipitation, 12.6 in snowfall 1.0❄13 FebMarch: 1.63 in precipitation, 8.1 in snowfall 1.6❄8 MarApril: 2.77 in precipitation, 4.1 in snowfall 2.8❄4 AprMay: 3.15 in precipitation, 0.1 in snowfall 3.1 MayJune: 3.31 in precipitation 3.3 JunJuly: 3.22 in precipitation 3.2 JulAugust: 3.79 in precipitation 3.8 AugSeptember: 3.05 in precipitation 3.0 SepOctober: 2.97 in precipitation, 0.2 in snowfall 3.0 OctNovember: 2.10 in precipitation, 1.6 in snowfall 2.1❄2 NovDecember: 1.62 in precipitation, 13.6 in snowfall 1.6❄14 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Forestville-4e, WI (11 mi away); precipitation: Forestville-4e, WI (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

542135b
Forestville, WI · 6 mi
542265b
Maplewood, WI · 6 mi
542055b
Casco, WI · 10 mi
542015b
Algoma, WI · 11 mi
542355b
Sturgeon Bay, WI · 13 mi
542175b
Luxemburg, WI · 15 mi
542295b
New Franken, WI · 17 mi
541535a
Oconto, WI · 18 mi

Wisconsin planting zones →

Questions about 54204

What planting zone is ZIP code 54204?

ZIP code 54204 (Brussels, WI) is in USDA hardiness zone 5b on the 2023 map: the coldest night of an average winter reaches −15 to −10 °F (−26.1 to −23.3 °C).

When is the last frost in Brussels, WI?

The median last spring frost (32 °F) near 54204 is May 6; after May 20 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Forestville-4e station.

When is the first frost in Brussels, WI?

The median first fall frost near 54204 is October 17, giving a median frost-free growing season of 163 days.

When should I plant tomatoes in 54204?

Start tomato seeds indoors around Mar 11 – Mar 25 and set transplants outside around May 13 – May 27, one to three weeks after the median last frost.

How much rain and snow does 54204 get?

About 30.1 inches of precipitation a year and 53 inches of snowfall (NOAA 1991–2020 normals, Forestville-4e station).

How hot do summers get in Brussels, WI?

The average high peaks at 77 °F in July, with about 1 days a year at 90 °F or more.

Did spring come early in Brussels, WI in 2026?

Spring leaf-out near 54204 came on Apr 22 in 2026, about the same as the 1991–2020 average (Apr 22), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Brussels, WI?

Long-day onions: the longest day near 54204 is 15 h 35 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).