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

Planting zone for 56673 — Roosevelt, MN

ZIP code 56673 (Roosevelt, Roseau County) is in USDA zone 3b: the coldest winter night averages −35 to −30 °F. The median last spring frost is May 25 and the first fall frost September 22.

Where ZIP 56673 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 frostMay 25

First frostSep 22

2012 zone3a

Was 3a 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 3b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Roosevelt, 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 Roosevelt, MN

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 22median — 10% chance by Sep 5

Growing season119 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 13 and returns around October 2.

From the NOAA station Camp Norris Dnr, MN — 11 miles away, elevation 1,289 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 56673

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 28 – Aug 11

GarlicPlant cloves · Sep 8 – Oct 13

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 25) and first fall frost (Sep 22) 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 56673 came on May 8 — 9 days later than the 1991–2020 average (Apr 29).

average
Apr 292026
May 8

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.

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 Roosevelt, MN.

Soil in Roosevelt, MN

The soil mapped at the center of ZIP 56673 is Leafriver — muck, very poorly drained.

TextureMucktop layer

pH5.9moderately acidic; most vegetables like 6.0–7.0

DrainageVery poorly drainedconsider raised beds

Organic matter70%high

Hydrologic groupA/Ddrains fast once dried out; wet otherwise

Farmland classNot prime farmlandUSDA classification

Map unit: Leafriver muck, 0 to 1 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 56673; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Roosevelt, MN

Summer high78 °Faverage high, July

Winter low−6 °Faverage low, January

Hot days3days a year at 90 °F or more

Freezing nights199nights a year at 32 °F or less

Growing degree days1,629base 50 °F — the season’s usable heat

Longest day16 h 10 mindaylight on June 21

Shortest day8 h 15 mindaylight on December 21

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

Precipitation25.1 inper year, rain and melted snow

Snowfall46 inper year; 144 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: Camp Norris Dnr, MN (11 mi away); precipitation: Camp Norris Dnr, MN (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 3b.

Angle Inlet, MN · 15 mi

Minnesota planting zones →

Questions about 56673

What planting zone is ZIP code 56673?

ZIP code 56673 (Roosevelt, 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 Roosevelt, MN?

The median last spring frost (32 °F) near 56673 is May 25; after June 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Camp Norris Dnr station.

When is the first frost in Roosevelt, MN?

The median first fall frost near 56673 is September 22, giving a median frost-free growing season of 119 days.

When should I plant tomatoes in 56673?

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 56673 get?

About 25.1 inches of precipitation a year and 46 inches of snowfall (NOAA 1991–2020 normals, Camp Norris Dnr station).

How hot do summers get in Roosevelt, MN?

The average high peaks at 78 °F in July, with about 3 days a year at 90 °F or more.

What kind of soil does 56673 have?

The USDA soil survey maps Leafriver at the center of ZIP 56673: muck, very poorly drained, pH about 5.9 (moderately acidic).

Did spring come early in Roosevelt, MN in 2026?

Spring leaf-out near 56673 came on May 8 in 2026, 9 days later than the 1991–2020 average (Apr 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Roosevelt, MN?

Long-day onions: the longest day near 56673 is 16 h 10 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 56673 change?

Yes. The 2012 USDA map put 56673 in zone 3a; the 2023 map puts it in zone 3b. The newer map uses 1991–2020 data and more weather stations.