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

Planting zone for 55082 — Stillwater, MN

ZIP code 55082 (Stillwater, Washington County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is April 30 and the first fall frost October 11.

Where ZIP 55082 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 frostApr 30
First frostOct 11
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 Stillwater, 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 Stillwater, MN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostApril 30median — 50% chance of a later frost
Safe for tender plantsMay 13only 10% chance of frost after
First fall frostOctober 11median — 10% chance by Sep 28
Growing season163 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 20 and returns around October 23.

From the NOAA station Stillwater 2sw, MN — 2 miles away, elevation 899 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 55082

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 19 – Apr 2
SpinachSow outdoors · Mar 19 – Apr 9
Broccoli, cabbageStart indoors · Feb 19 – Mar 5
Broccoli, cabbageTransplant · Apr 9 – Apr 23
Onion setsPlant outdoors · Apr 2 – Apr 16
PotatoesPlant outdoors · Apr 9 – Apr 23
LettuceSow outdoors · Apr 2 – Apr 16
Carrots, beetsSow outdoors · Apr 9 – Apr 23
TomatoesStart indoors · Mar 5 – Mar 19
TomatoesTransplant · May 7 – May 21
Peppers, eggplantStart indoors · Feb 19 – Mar 5
Peppers, eggplantTransplant · May 14 – May 28
BeansSow outdoors · May 7 – May 21
Sweet cornSow outdoors · May 7 – May 21
Cucumbers, squashSow outdoors · May 7 – May 21
Fall lettuce, spinachSow outdoors · Aug 16 – Aug 30
GarlicPlant cloves · Sep 27 – Nov 1
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 30) and first fall frost (Oct 11) 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 55082 came on Apr 11 — 6 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 4b in Minnesota

497 plants native to the lower 48 states, recorded in Minnesota, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. Each links to its USDA PLANTS profile.

Trees 47

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 °Farborvitae50 ft · blooms mid spring · medium shade tolerance · to −33 °Fbalsam fir60 ft · blooms mid summer · low shade tolerance · to −43 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °F

Shrubs 88

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 190

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high 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 °F

Grasses 156

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °FAmerican 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 °Fbasin wildrye5 ft · blooms early spring · high shade tolerance · to −43 °Fbeaked sedge4 ft · blooms late spring · low shade tolerance · to −38 °F

Vines 4

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 °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 Stillwater, MN.

Soil in Stillwater, MN

The soil mapped at the center of ZIP 55082 is Brill — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables
pH5.9moderately acidic; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter3%moderate
Hydrologic groupCwater soaks in slowly
Farmland classprime farmlandUSDA classification

Map unit: Brill silt loam.

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 55082; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Stillwater, MN

Summer high79 °Faverage high, July
Winter low5 °Faverage low, January
Hot days4days a year at 90 °F or more
Freezing nights159nights a year at 32 °F or less
Growing degree days2,473base 50 °F — the season’s usable heat
Longest day15 h 38 mindaylight on June 21
Shortest day8 h 45 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation33.2 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 22 °F, low 5 °F 22°5° JanFebruary: average high 28 °F, low 8 °F 28°8° FebMarch: average high 41 °F, low 20 °F 41°20° MarApril: average high 55 °F, low 34 °F 55°34° AprMay: average high 67 °F, low 47 °F 67°47° MayJune: average high 76 °F, low 58 °F 76°58° JunJuly: average high 79 °F, low 62 °F 79°62° JulAugust: average high 78 °F, low 60 °F 78°60° AugSeptember: average high 71 °F, low 51 °F 71°51° SepOctober: average high 58 °F, low 38 °F 58°38° OctNovember: average high 41 °F, low 25 °F 41°25° NovDecember: average high 28 °F, low 13 °F 28°13° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 0.85 in precipitation 0.8 JanFebruary: 0.92 in precipitation 0.9 FebMarch: 1.62 in precipitation 1.6 MarApril: 2.97 in precipitation 3.0 AprMay: 4.17 in precipitation 4.2 MayJune: 4.79 in precipitation 4.8 JunJuly: 4.38 in precipitation 4.4 JulAugust: 4.41 in precipitation 4.4 AugSeptember: 3.32 in precipitation 3.3 SepOctober: 2.74 in precipitation 2.7 OctNovember: 1.82 in precipitation 1.8 NovDecember: 1.21 in precipitation 1.2 Dec

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

Nearby ZIP codes

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

540824b
Houlton, WI · 4 mi
551155a
Saint Paul, MN · 5 mi
550035a
Bayport, MN · 6 mi
550425a
Lake Elmo, MN · 6 mi
550835a
Stillwater, MN · 8 mi
551105a
Saint Paul, MN · 8 mi
551285a
Saint Paul, MN · 8 mi
550474b
Marine On Saint Croix, MN · 9 mi

All 2 ZIP codes in Stillwater → · Minnesota planting zones →

Questions about 55082

What planting zone is ZIP code 55082?

ZIP code 55082 (Stillwater, MN) 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 Stillwater, MN?

The median last spring frost (32 °F) near 55082 is April 30; after May 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Stillwater 2sw station.

When is the first frost in Stillwater, MN?

The median first fall frost near 55082 is October 11, giving a median frost-free growing season of 163 days.

When should I plant tomatoes in 55082?

Start tomato seeds indoors around Mar 5 – Mar 19 and set transplants outside around May 7 – May 21, one to three weeks after the median last frost.

How much rain and snow does 55082 get?

About 33.2 inches of precipitation a year (NOAA 1991–2020 normals, Stillwater 2sw station).

How hot do summers get in Stillwater, MN?

The average high peaks at 79 °F in July, with about 4 days a year at 90 °F or more.

What kind of soil does 55082 have?

The USDA soil survey maps Brill at the center of ZIP 55082: silt loam, moderately well drained, pH about 5.9 (moderately acidic).

Did spring come early in Stillwater, MN in 2026?

Spring leaf-out near 55082 came on Apr 11 in 2026, 6 days earlier than the 1991–2020 average (Apr 17), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Stillwater, MN?

Long-day onions: the longest day near 55082 is 15 h 38 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).