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

Planting zone for 53004 — Belgium, WI

ZIP code 53004 (Belgium, Ozaukee County) is in USDA zone 5b: the coldest winter night averages −15 to −10 °F. The median last spring frost is May 5 and the first fall frost October 12.

Where ZIP 53004 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 5
First frostOct 12
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 Belgium, 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 Belgium, WI

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 5median — 50% chance of a later frost
Safe for tender plantsMay 22only 10% chance of frost after
First fall frostOctober 12median — 10% chance by Sep 27
Growing season159 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 22 and returns around October 25.

From the NOAA station Belgium Wwtp, WI — 2 miles away, elevation 732 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 53004

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 24 – Apr 7
SpinachSow outdoors · Mar 24 – Apr 14
Broccoli, cabbageStart indoors · Feb 24 – Mar 10
Broccoli, cabbageTransplant · Apr 14 – Apr 28
Onion setsPlant outdoors · Apr 7 – Apr 21
PotatoesPlant outdoors · Apr 14 – Apr 28
LettuceSow outdoors · Apr 7 – Apr 21
Carrots, beetsSow outdoors · Apr 14 – Apr 28
TomatoesStart indoors · Mar 10 – Mar 24
TomatoesTransplant · May 12 – May 26
Peppers, eggplantStart indoors · Feb 24 – Mar 10
Peppers, eggplantTransplant · May 19 – Jun 2
BeansSow outdoors · May 12 – May 26
Sweet cornSow outdoors · May 12 – May 26
Cucumbers, squashSow outdoors · May 12 – May 26
Fall lettuce, spinachSow outdoors · Aug 17 – Aug 31
GarlicPlant cloves · Sep 28 – Nov 2
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 5) and first fall frost (Oct 12) 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 53004 came on Apr 7 — 10 days earlier than the 1991–2020 average (Apr 17).

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 Belgium, WI.

Soil in Belgium, WI

The center of ZIP 53004 is mapped as Alluvial land: 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 53004; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Belgium, WI

Summer high80 °Faverage high, July
Winter low11 °Faverage low, January
Hot days4days a year at 90 °F or more
Freezing nights154nights a year at 32 °F or less
Growing degree days2,199base 50 °F — the season’s usable heat
Longest day15 h 25 mindaylight on June 21
Shortest day8 h 57 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation31.9 inper year, rain and melted snow

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 27 °F, low 11 °F 27°11° JanFebruary: average high 31 °F, low 13 °F 31°13° FebMarch: average high 40 °F, low 23 °F 40°23° MarApril: average high 52 °F, low 33 °F 52°33° AprMay: average high 63 °F, low 44 °F 63°44° MayJune: average high 74 °F, low 54 °F 74°54° JunJuly: average high 80 °F, low 60 °F 80°60° JulAugust: average high 78 °F, low 59 °F 78°59° AugSeptember: average high 71 °F, low 50 °F 71°50° SepOctober: average high 58 °F, low 39 °F 58°39° OctNovember: average high 44 °F, low 28 °F 44°28° NovDecember: average high 33 °F, low 18 °F 33°18° Dec

Precipitation by month inches

0″1″2″3″4″January: 1.43 in precipitation 1.4 JanFebruary: 1.32 in precipitation 1.3 FebMarch: 1.99 in precipitation 2.0 MarApril: 3.57 in precipitation 3.6 AprMay: 3.71 in precipitation 3.7 MayJune: 3.86 in precipitation 3.9 JunJuly: 3.52 in precipitation 3.5 JulAugust: 3.26 in precipitation 3.3 AugSeptember: 2.75 in precipitation 2.8 SepOctober: 2.70 in precipitation 2.7 OctNovember: 1.96 in precipitation 2.0 NovDecember: 1.81 in precipitation 1.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Belgium Wwtp, WI (2 mi away); precipitation: Belgium Wwtp, WI (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5b.

530745b
Port Washington, WI · 5 mi
530135b
Cedar Grove, WI · 5 mi
530215b
Fredonia, WI · 6 mi
530755b
Random Lake, WI · 7 mi
530805b
Saukville, WI · 8 mi
530705b
Oostburg, WI · 9 mi
530315b
Hingham, WI · 10 mi
530605b
Newburg, WI · 10 mi

Wisconsin planting zones →

Questions about 53004

What planting zone is ZIP code 53004?

ZIP code 53004 (Belgium, 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 Belgium, WI?

The median last spring frost (32 °F) near 53004 is May 5; after May 22 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Belgium Wwtp station.

When is the first frost in Belgium, WI?

The median first fall frost near 53004 is October 12, giving a median frost-free growing season of 159 days.

When should I plant tomatoes in 53004?

Start tomato seeds indoors around Mar 10 – Mar 24 and set transplants outside around May 12 – May 26, one to three weeks after the median last frost.

How much rain and snow does 53004 get?

About 31.9 inches of precipitation a year (NOAA 1991–2020 normals, Belgium Wwtp station).

How hot do summers get in Belgium, WI?

The average high peaks at 80 °F in July, with about 4 days a year at 90 °F or more.

Did spring come early in Belgium, WI in 2026?

Spring leaf-out near 53004 came on Apr 7 in 2026, 10 days earlier than the 1991–2020 average (Apr 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Belgium, WI?

Long-day onions: the longest day near 53004 is 15 h 25 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).