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

Planting zone for 54758 — Osseo, WI

ZIP code 54758 (Osseo, Trempealeau County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 7 and the first fall frost October 1.

Where ZIP 54758 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.

Zone4b−25 to −20 °F

Coldest night−31.7 to −28.9 °C

Last frostMay 7

First frostOct 1

2012 zone4b

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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Osseo, 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 Osseo, WI

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 7median — 50% chance of a later frost

Safe for tender plantsMay 20only 10% chance of frost after

First fall frostOctober 1median — 10% chance by Sep 17

Growing season146 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 26 and returns around October 11.

From the NOAA station Augusta Rs, WI — 9 miles away, elevation 961 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 54758

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 26 – Apr 9

SpinachSow outdoors · Mar 26 – Apr 16

Broccoli, cabbageStart indoors · Feb 26 – Mar 12

Broccoli, cabbageTransplant · Apr 16 – Apr 30

Onion setsPlant outdoors · Apr 9 – Apr 23

PotatoesPlant outdoors · Apr 16 – Apr 30

LettuceSow outdoors · Apr 9 – Apr 23

Carrots, beetsSow outdoors · Apr 16 – Apr 30

TomatoesStart indoors · Mar 12 – Mar 26

TomatoesTransplant · May 14 – May 28

Peppers, eggplantStart indoors · Feb 26 – Mar 12

Peppers, eggplantTransplant · May 21 – Jun 4

BeansSow outdoors · May 14 – May 28

Sweet cornSow outdoors · May 14 – May 28

Cucumbers, squashSow outdoors · May 14 – May 28

Fall lettuce, spinachSow outdoors · Aug 6 – Aug 20

GarlicPlant cloves · Sep 17 – Oct 22

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 7) and first fall frost (Oct 1) 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 54758 came on Apr 11 — 7 days earlier than the 1991–2020 average (Apr 18).

average
Apr 182026
Apr 11

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 4b in Wisconsin

486 plants native to the lower 48 states, recorded in Wisconsin, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. 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 Osseo, WI.

Soil in Osseo, WI

The soil mapped at the center of ZIP 54758 is Merit — silt loam, well drained.

TextureSilt loama good balance for most vegetables

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

DrainageWell drainednatural drainage class

Organic matter2.5%moderate

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Merit silt loam, 1 to 6 percent slopes.

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 54758; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Osseo, WI

Summer high82 °Faverage high, July

Winter low4 °Faverage low, January

Hot days6days a year at 90 °F or more

Freezing nights168nights a year at 32 °F or less

Growing degree days2,339base 50 °F — the season’s usable heat

Longest day15 h 34 mindaylight on June 21

Shortest day8 h 49 mindaylight on December 21

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

Precipitation34.5 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: Augusta Rs, WI (9 mi away); precipitation: Augusta Rs, WI (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4b.

547704b

Strum, WI · 8 mi

547604b

Pigeon Falls, WI · 9 mi

547224b

Augusta, WI · 12 mi

547414b

Fairchild, WI · 12 mi

547734b

Whitehall, WI · 12 mi

Fall Creek, WI · 14 mi

Wisconsin planting zones →

Questions about 54758

What planting zone is ZIP code 54758?

ZIP code 54758 (Osseo, WI) is in USDA hardiness zone 4b on the 2023 map: the coldest night of an average winter reaches −25 to −20 °F (−31.7 to −28.9 °C).

When is the last frost in Osseo, WI?

The median last spring frost (32 °F) near 54758 is May 7; after May 20 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Augusta Rs station.

When is the first frost in Osseo, WI?

The median first fall frost near 54758 is October 1, giving a median frost-free growing season of 146 days.

When should I plant tomatoes in 54758?

Start tomato seeds indoors around Mar 12 – Mar 26 and set transplants outside around May 14 – May 28, one to three weeks after the median last frost.

How much rain and snow does 54758 get?

About 34.5 inches of precipitation a year (NOAA 1991–2020 normals, Augusta Rs station).

How hot do summers get in Osseo, WI?

The average high peaks at 82 °F in July, with about 6 days a year at 90 °F or more.

What kind of soil does 54758 have?

The USDA soil survey maps Merit at the center of ZIP 54758: silt loam, well drained, pH about 5.9 (moderately acidic).

Did spring come early in Osseo, WI in 2026?

Spring leaf-out near 54758 came on Apr 11 in 2026, 7 days earlier than the 1991–2020 average (Apr 18), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Osseo, WI?

Long-day onions: the longest day near 54758 is 15 h 34 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).