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

Planting zone for 55047 — Marine On Saint Croix, MN

ZIP code 55047 (Marine On Saint Croix, Washington County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 3 and the first fall frost October 5.

Where ZIP 55047 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 3
First frostOct 5
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 Marine On Saint Croix, 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 Marine On Saint Croix, MN

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 3median — 50% chance of a later frost
Safe for tender plantsMay 19only 10% chance of frost after
First fall frostOctober 5median — 10% chance by Sep 22
Growing season154 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 24 and returns around October 17.

From the NOAA station Forest Lake 5ne, MN — 10 miles away, elevation 906 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 55047

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 22 – Apr 5
SpinachSow outdoors · Mar 22 – Apr 12
Broccoli, cabbageStart indoors · Feb 22 – Mar 8
Broccoli, cabbageTransplant · Apr 12 – Apr 26
Onion setsPlant outdoors · Apr 5 – Apr 19
PotatoesPlant outdoors · Apr 12 – Apr 26
LettuceSow outdoors · Apr 5 – Apr 19
Carrots, beetsSow outdoors · Apr 12 – Apr 26
TomatoesStart indoors · Mar 8 – Mar 22
TomatoesTransplant · May 10 – May 24
Peppers, eggplantStart indoors · Feb 22 – Mar 8
Peppers, eggplantTransplant · May 17 – May 31
BeansSow outdoors · May 10 – May 24
Sweet cornSow outdoors · May 10 – May 24
Cucumbers, squashSow outdoors · May 10 – May 24
Fall lettuce, spinachSow outdoors · Aug 10 – Aug 24
GarlicPlant cloves · Sep 21 – Oct 26
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 3) and first fall frost (Oct 5) 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 55047 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 Marine On Saint Croix, MN.

Soil in Marine On Saint Croix, MN

The soil mapped at the center of ZIP 55047 is Santiago — 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 matter3%moderate
Hydrologic groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Santiago silt loam, 2 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 55047; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Marine On Saint Croix, MN

Summer high83 °Faverage high, July
Winter low3 °Faverage low, January
Hot days14days a year at 90 °F or more
Freezing nights161nights a year at 32 °F or less
Growing degree days2,620base 50 °F — the season’s usable heat
Longest day15 h 39 mindaylight on June 21
Shortest day8 h 44 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation33.1 inper year, rain and melted snow
Snowfall52 inper year; 106 days with snow on the ground

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°32 °FJanuary: average high 24 °F, low 3 °F 24°3° JanFebruary: average high 30 °F, low 6 °F 30°6° FebMarch: average high 43 °F, low 19 °F 43°19° MarApril: average high 58 °F, low 33 °F 58°33° AprMay: average high 70 °F, low 45 °F 70°45° MayJune: average high 79 °F, low 56 °F 79°56° JunJuly: average high 83 °F, low 60 °F 83°60° JulAugust: average high 82 °F, low 58 °F 82°58° AugSeptember: average high 74 °F, low 50 °F 74°50° SepOctober: average high 60 °F, low 37 °F 60°37° OctNovember: average high 43 °F, low 24 °F 43°24° NovDecember: average high 29 °F, low 11 °F 29°11° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″January: 0.88 in precipitation, 9.6 in snowfall 0.9❄10 JanFebruary: 0.90 in precipitation, 9.3 in snowfall 0.9❄9 FebMarch: 1.70 in precipitation, 9.2 in snowfall 1.7❄9 MarApril: 3.00 in precipitation, 3.7 in snowfall 3.0❄4 AprMay: 4.36 in precipitation 4.4 MayJune: 4.48 in precipitation 4.5 JunJuly: 4.70 in precipitation 4.7 JulAugust: 4.03 in precipitation 4.0 AugSeptember: 3.18 in precipitation 3.2 SepOctober: 2.91 in precipitation, 0.6 in snowfall 2.9❄1 OctNovember: 1.80 in precipitation, 7.4 in snowfall 1.8❄7 NovDecember: 1.17 in precipitation, 11.8 in snowfall 1.2❄12 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Forest Lake 5ne, MN (10 mi away); precipitation: Forest Lake 5ne, MN (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4b.

550734b
Scandia, MN · 5 mi
540254b
Somerset, WI · 8 mi
550384b
Hugo, MN · 8 mi
550824b
Stillwater, MN · 9 mi
540204b
Osceola, WI · 9 mi
540824b
Houlton, WI · 10 mi
550254b
Forest Lake, MN · 10 mi
550134b
Chisago City, MN · 11 mi

Minnesota planting zones →

Questions about 55047

What planting zone is ZIP code 55047?

ZIP code 55047 (Marine On Saint Croix, 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 Marine On Saint Croix, MN?

The median last spring frost (32 °F) near 55047 is May 3; after May 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Forest Lake 5ne station.

When is the first frost in Marine On Saint Croix, MN?

The median first fall frost near 55047 is October 5, giving a median frost-free growing season of 154 days.

When should I plant tomatoes in 55047?

Start tomato seeds indoors around Mar 8 – Mar 22 and set transplants outside around May 10 – May 24, one to three weeks after the median last frost.

How much rain and snow does 55047 get?

About 33.1 inches of precipitation a year and 52 inches of snowfall (NOAA 1991–2020 normals, Forest Lake 5ne station).

How hot do summers get in Marine On Saint Croix, MN?

The average high peaks at 83 °F in July, with about 14 days a year at 90 °F or more.

What kind of soil does 55047 have?

The USDA soil survey maps Santiago at the center of ZIP 55047: silt loam, well drained, pH about 5.9 (moderately acidic).

Did spring come early in Marine On Saint Croix, MN in 2026?

Spring leaf-out near 55047 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 Marine On Saint Croix, MN?

Long-day onions: the longest day near 55047 is 15 h 39 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).