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

Planting zone for 55746 — Hibbing, MN

ZIP code 55746 (Hibbing, St. Louis County) is in USDA zone 3b: the coldest winter night averages −35 to −30 °F. The median last spring frost is June 5 and the first fall frost September 8.

Where ZIP 55746 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.

Zone3b−35 to −30 °F
Coldest night−37.2 to −34.4 °C
Last frostJun 5
First frostSep 8
2012 zone3b

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 3b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Hibbing, MN…

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 Hibbing, MN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostJune 5median — 50% chance of a later frost
Safe for tender plantsJune 25only 10% chance of frost after
First fall frostSeptember 8median — 10% chance by Aug 23
Growing season93 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 23 and returns around September 21.

From the NOAA station Hibbing Chisholm Hibbing Airport, MN — 6 miles away, elevation 1,352 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 55746

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 24 – May 8
SpinachSow outdoors · Apr 24 – May 15
Broccoli, cabbageStart indoors · Mar 27 – Apr 10
Broccoli, cabbageTransplant · May 15 – May 29
Onion setsPlant outdoors · May 8 – May 22
PotatoesPlant outdoors · May 15 – May 29
LettuceSow outdoors · May 8 – May 22
Carrots, beetsSow outdoors · May 15 – May 29
TomatoesStart indoors · Apr 10 – Apr 24
TomatoesTransplant · Jun 12 – Jun 26
Peppers, eggplantStart indoors · Mar 27 – Apr 10
Peppers, eggplantTransplant · Jun 19 – Jul 3
BeansSow outdoors · Jun 12 – Jun 26
Sweet cornSow outdoors · Jun 12 – Jun 26
Cucumbers, squashSow outdoors · Jun 12 – Jun 26
Fall lettuce, spinachSow outdoors · Jul 14 – Jul 28
GarlicPlant cloves · Aug 25 – Sep 29
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 5) and first fall frost (Sep 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 55746 came on Apr 25 — about the same time as the 1991–2020 average (Apr 27).

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 3b in Minnesota

287 plants native to the lower 48 states, recorded in Minnesota, and rated by the USDA to survive −35 °F or colder — the bottom of zone 3b. Each links to its USDA PLANTS profile.

Trees 33

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °Fbalsam fir60 ft · blooms mid summer · low shade tolerance · to −43 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fbigtooth aspen65 ft · blooms mid spring · high shade tolerance · to −43 °F

Shrubs 50

Allegheny 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 mountain ash40 ft · blooms early summer · medium shade tolerance · to −38 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fbeaked hazelnut15 ft · blooms early spring · low shade tolerance · to −47 °F

Wildflowers & perennials 102

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican speedwell0.8 ft · blooms mid summer · low shade tolerance · to −38 °FAmerican vetch1.3 ft · blooms late spring · high shade tolerance · to −38 °F

Grasses 93

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °Fbasin wildrye5 ft · blooms early spring · high shade tolerance · to −43 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °FBebb's sedge3 ft · blooms late spring · low shade tolerance · to −38 °FBicknell's sedge3 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 2

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °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 Hibbing, MN.

Soil in Hibbing, MN

The soil mapped at the center of ZIP 55746 is Udipsamments, well drained.

DrainageWell drainednatural drainage class
Farmland classNot prime farmlandUSDA classification

Map unit: Pits, gravel-Udipsamments complex.

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 55746; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hibbing, MN

Summer high77 °Faverage high, July
Winter low−4 °Faverage low, January
Hot days2days a year at 90 °F or more
Freezing nights205nights a year at 32 °F or less
Growing degree days1,336base 50 °F — the season’s usable heat
Longest day15 h 57 mindaylight on June 21
Shortest day8 h 28 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation24.8 inper year, rain and melted snow

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 17 °F, low -4 °F 17°−4° JanFebruary: average high 23 °F, low -1 °F 23°−1° FebMarch: average high 35 °F, low 12 °F 35°12° MarApril: average high 50 °F, low 25 °F 50°25° AprMay: average high 63 °F, low 36 °F 63°36° MayJune: average high 72 °F, low 46 °F 72°46° JunJuly: average high 77 °F, low 50 °F 77°50° JulAugust: average high 75 °F, low 48 °F 75°48° AugSeptember: average high 66 °F, low 40 °F 66°40° SepOctober: average high 51 °F, low 30 °F 51°30° OctNovember: average high 34 °F, low 17 °F 34°17° NovDecember: average high 21 °F, low 3 °F 21°3° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 0.51 in precipitation 0.5 JanFebruary: 0.53 in precipitation 0.5 FebMarch: 0.91 in precipitation 0.9 MarApril: 1.61 in precipitation 1.6 AprMay: 2.76 in precipitation 2.8 MayJune: 4.36 in precipitation 4.4 JunJuly: 3.85 in precipitation 3.9 JulAugust: 3.09 in precipitation 3.1 AugSeptember: 3.06 in precipitation 3.1 SepOctober: 2.35 in precipitation 2.4 OctNovember: 1.09 in precipitation 1.1 NovDecember: 0.64 in precipitation 0.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hibbing Chisholm Hibbing Airport, MN (6 mi away); precipitation: Hibbing Chisholm Hibbing Airport, MN (6 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.

557534a
Keewatin, MN · 7 mi
557754a
Pengilly, MN · 10 mi
557513b
Iron, MN · 14 mi
557133b
Buhl, MN · 14 mi
557424a
Goodland, MN · 14 mi
557383b
Forbes, MN · 15 mi
557693b
Nashwauk, MN · 15 mi
557193b
Chisholm, MN · 15 mi

Minnesota planting zones →

Questions about 55746

What planting zone is ZIP code 55746?

ZIP code 55746 (Hibbing, MN) is in USDA hardiness zone 3b on the 2023 map: the coldest night of an average winter reaches −35 to −30 °F (−37.2 to −34.4 °C).

When is the last frost in Hibbing, MN?

The median last spring frost (32 °F) near 55746 is June 5; after June 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Hibbing Chisholm Hibbing Airport station.

When is the first frost in Hibbing, MN?

The median first fall frost near 55746 is September 8, giving a median frost-free growing season of 93 days.

When should I plant tomatoes in 55746?

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

How much rain and snow does 55746 get?

About 24.8 inches of precipitation a year (NOAA 1991–2020 normals, Hibbing Chisholm Hibbing Airport station).

How hot do summers get in Hibbing, MN?

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

Did spring come early in Hibbing, MN in 2026?

Spring leaf-out near 55746 came on Apr 25 in 2026, about the same as the 1991–2020 average (Apr 27), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hibbing, MN?

Long-day onions: the longest day near 55746 is 15 h 57 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).