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

Planting zone for 54519 — Conover, WI

ZIP code 54519 (Conover, Vilas County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 25 and the first fall frost September 24.

Where ZIP 54519 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 25

First frostSep 24

2012 zone4a

Was 4a on the 2012 map — half a zone warmer now. 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 Conover, 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 Conover, WI

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 25median — 50% chance of a later frost

Safe for tender plantsJune 6only 10% chance of frost after

First fall frostSeptember 24median — 10% chance by Sep 8

Growing season121 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 13 and returns around October 5.

From the NOAA station Eagle Rvr, WI — 9 miles away, elevation 1,624 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 54519

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 13 – Apr 27

SpinachSow outdoors · Apr 13 – May 4

Broccoli, cabbageStart indoors · Mar 16 – Mar 30

Broccoli, cabbageTransplant · May 4 – May 18

Onion setsPlant outdoors · Apr 27 – May 11

PotatoesPlant outdoors · May 4 – May 18

LettuceSow outdoors · Apr 27 – May 11

Carrots, beetsSow outdoors · May 4 – May 18

TomatoesStart indoors · Mar 30 – Apr 13

TomatoesTransplant · Jun 1 – Jun 15

Peppers, eggplantStart indoors · Mar 16 – Mar 30

Peppers, eggplantTransplant · Jun 8 – Jun 22

BeansSow outdoors · Jun 1 – Jun 15

Sweet cornSow outdoors · Jun 1 – Jun 15

Cucumbers, squashSow outdoors · Jun 1 – Jun 15

Fall lettuce, spinachSow outdoors · Jul 30 – Aug 13

GarlicPlant cloves · Sep 10 – Oct 15

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 25) and first fall frost (Sep 24) 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 54519 came on Apr 23 — 5 days earlier than the 1991–2020 average (Apr 28).

average
Apr 282026
Apr 23

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 Conover, WI.

Soil in Conover, WI

The soil mapped at the center of ZIP 54519 is Cublake — loamy sand, moderately well drained.

TextureLoamy sanddrains and warms fast; dries out and needs more feeding

pH5.5moderately acidic; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter1.25%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Cublake loamy sand, 0 to 4 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 54519; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Conover, WI

Summer high78 °Faverage high, July

Winter low2 °Faverage low, January

Hot days2days a year at 90 °F or more

Freezing nights191nights a year at 32 °F or less

Growing degree days1,723base 50 °F — the season’s usable heat

Longest day15 h 46 mindaylight on June 21

Shortest day8 h 38 mindaylight on December 21

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

Precipitation33.4 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: Eagle Rvr, WI (9 mi away); precipitation: Buckatabon, WI (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

545614b

Star Lake, WI · 8 mi

545404a

Land O Lakes, WI · 9 mi

545544b

Phelps, WI · 10 mi

545214b

Eagle River, WI · 10 mi

499694b

Watersmeet, MI · 14 mi

545604b

Sayner, WI · 14 mi

545584a

Saint Germain, WI · 14 mi

545124a

Boulder Junction, WI · 19 mi

Wisconsin planting zones →

Questions about 54519

What planting zone is ZIP code 54519?

ZIP code 54519 (Conover, 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 Conover, WI?

The median last spring frost (32 °F) near 54519 is May 25; after June 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Eagle Rvr station.

When is the first frost in Conover, WI?

The median first fall frost near 54519 is September 24, giving a median frost-free growing season of 121 days.

When should I plant tomatoes in 54519?

Start tomato seeds indoors around Mar 30 – Apr 13 and set transplants outside around Jun 1 – Jun 15, one to three weeks after the median last frost.

How much rain and snow does 54519 get?

About 33.4 inches of precipitation a year (NOAA 1991–2020 normals, Buckatabon station).

How hot do summers get in Conover, WI?

The average high peaks at 78 °F in July, with about 2 days a year at 90 °F or more.

What kind of soil does 54519 have?

The USDA soil survey maps Cublake at the center of ZIP 54519: loamy sand, moderately well drained, pH about 5.5 (moderately acidic).

Did spring come early in Conover, WI in 2026?

Spring leaf-out near 54519 came on Apr 23 in 2026, 5 days earlier than the 1991–2020 average (Apr 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Conover, WI?

Long-day onions: the longest day near 54519 is 15 h 46 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 54519 change?

Yes. The 2012 USDA map put 54519 in zone 4a; the 2023 map puts it in zone 4b. The newer map uses 1991–2020 data and more weather stations.