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

Planting zone for 54814 — Bayfield, WI

ZIP code 54814 (Bayfield, Bayfield County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 20 and the first fall frost October 8.

Where ZIP 54814 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.

Zone5a−20 to −15 °F

Coldest night−28.9 to −26.1 °C

Last frostMay 20

First frostOct 8

2012 zone5a

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 5a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Bayfield, 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 Bayfield, WI

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 20median — 50% chance of a later frost

Safe for tender plantsJune 5only 10% chance of frost after

First fall frostOctober 8median — 10% chance by Sep 21

Growing season141 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 3 and returns around October 24.

From the NOAA station Bayfield 6 N, WI — 4 miles away, elevation 820 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 54814

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 8 – Apr 22

SpinachSow outdoors · Apr 8 – Apr 29

Broccoli, cabbageStart indoors · Mar 11 – Mar 25

Broccoli, cabbageTransplant · Apr 29 – May 13

Onion setsPlant outdoors · Apr 22 – May 6

PotatoesPlant outdoors · Apr 29 – May 13

LettuceSow outdoors · Apr 22 – May 6

Carrots, beetsSow outdoors · Apr 29 – May 13

TomatoesStart indoors · Mar 25 – Apr 8

TomatoesTransplant · May 27 – Jun 10

Peppers, eggplantStart indoors · Mar 11 – Mar 25

Peppers, eggplantTransplant · Jun 3 – Jun 17

BeansSow outdoors · May 27 – Jun 10

Sweet cornSow outdoors · May 27 – Jun 10

Cucumbers, squashSow outdoors · May 27 – Jun 10

Fall lettuce, spinachSow outdoors · Aug 13 – Aug 27

GarlicPlant cloves · Sep 24 – Oct 29

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 20) and first fall frost (Oct 8) 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 54814 came on May 1 — about the same time as the 1991–2020 average (Apr 29).

average
Apr 292026
May 1

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 5a in Wisconsin

510 plants native to the lower 48 states, recorded in Wisconsin, and rated by the USDA to survive −20 °F or colder — the bottom of zone 5a. 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 Bayfield, WI.

Soil in Bayfield, WI

The soil mapped at the center of ZIP 54814 is Keweenaw — loamy sand, well drained.

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

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

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Keweenaw, stony-Rubicon complex, 0 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 54814; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Bayfield, WI

Summer high77 °Faverage high, July

Winter low7 °Faverage low, January

Hot days2days a year at 90 °F or more

Freezing nights177nights a year at 32 °F or less

Growing degree days1,794base 50 °F — the season’s usable heat

Longest day15 h 53 mindaylight on June 21

Shortest day8 h 31 mindaylight on December 21

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

Precipitation33.3 inper year, rain and melted snow

Snowfall106 inper year; 134 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Bayfield 6 N, WI (4 mi away); precipitation: Bayfield 6 N, WI (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

548274b

Cornucopia, WI · 11 mi

La Pointe, WI · 16 mi

Port Wing, WI · 24 mi

548164b

Benoit, WI · 26 mi

Wisconsin planting zones →

Questions about 54814

What planting zone is ZIP code 54814?

ZIP code 54814 (Bayfield, WI) is in USDA hardiness zone 5a on the 2023 map: the coldest night of an average winter reaches −20 to −15 °F (−28.9 to −26.1 °C).

When is the last frost in Bayfield, WI?

The median last spring frost (32 °F) near 54814 is May 20; after June 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bayfield 6 N station.

When is the first frost in Bayfield, WI?

The median first fall frost near 54814 is October 8, giving a median frost-free growing season of 141 days.

When should I plant tomatoes in 54814?

Start tomato seeds indoors around Mar 25 – Apr 8 and set transplants outside around May 27 – Jun 10, one to three weeks after the median last frost.

How much rain and snow does 54814 get?

About 33.3 inches of precipitation a year and 106 inches of snowfall (NOAA 1991–2020 normals, Bayfield 6 N station).

How hot do summers get in Bayfield, WI?

The average high peaks at 77 °F in July, with about 2 days a year at 90 °F or more.

What kind of soil does 54814 have?

The USDA soil survey maps Keweenaw at the center of ZIP 54814: loamy sand, well drained, pH about 5.5 (moderately acidic).

Did spring come early in Bayfield, WI in 2026?

Spring leaf-out near 54814 came on May 1 in 2026, about the same as the 1991–2020 average (Apr 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Bayfield, WI?

Long-day onions: the longest day near 54814 is 15 h 53 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).