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

Planting zone for 56762 — Warren, MN

ZIP code 56762 (Warren, Marshall County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 5 and the first fall frost October 2.

Where ZIP 56762 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.

Zone4a−30 to −25 °F

Coldest night−34.4 to −31.7 °C

Last frostMay 5

First frostOct 2

2012 zone3b

Was 3b 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 4a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Warren, 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 Warren, MN

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 5median — 50% chance of a later frost

Safe for tender plantsMay 22only 10% chance of frost after

First fall frostOctober 2median — 10% chance by Sep 20

Growing season147 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 28 and returns around October 10.

From the NOAA station Warren Wsd, MN — 2 miles away, elevation 856 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 56762

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 24 – Apr 7

SpinachSow outdoors · Mar 24 – Apr 14

Broccoli, cabbageStart indoors · Feb 24 – Mar 10

Broccoli, cabbageTransplant · Apr 14 – Apr 28

Onion setsPlant outdoors · Apr 7 – Apr 21

PotatoesPlant outdoors · Apr 14 – Apr 28

LettuceSow outdoors · Apr 7 – Apr 21

Carrots, beetsSow outdoors · Apr 14 – Apr 28

TomatoesStart indoors · Mar 10 – Mar 24

TomatoesTransplant · May 12 – May 26

Peppers, eggplantStart indoors · Feb 24 – Mar 10

Peppers, eggplantTransplant · May 19 – Jun 2

BeansSow outdoors · May 12 – May 26

Sweet cornSow outdoors · May 12 – May 26

Cucumbers, squashSow outdoors · May 12 – May 26

Fall lettuce, spinachSow outdoors · Aug 7 – Aug 21

GarlicPlant cloves · Sep 18 – Oct 23

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 5) and first fall frost (Oct 2) 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 56762 came on Apr 26 — about the same time as the 1991–2020 average (Apr 25).

average
Apr 252026
Apr 26

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 4a in Minnesota

445 plants native to the lower 48 states, recorded in Minnesota, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. 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 Warren, MN.

Soil in Warren, MN

The soil mapped at the center of ZIP 56762 is Wheatville — very fine sandy loam, somewhat poorly drained.

TextureVery fine sandy loamdrains and warms fast; dries out and needs more feeding

pH7.8slightly alkaline; most vegetables like 6.0–7.0

DrainageSomewhat poorly drainedconsider raised beds

Organic matter4%moderate

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Wheatville very fine sandy loam, 0 to 2 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 56762; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Warren, MN

Summer high81 °Faverage high, July

Winter low−7 °Faverage low, January

Hot days6days a year at 90 °F or more

Freezing nights184nights a year at 32 °F or less

Growing degree days2,135base 50 °F — the season’s usable heat

Longest day16 h 04 mindaylight on June 21

Shortest day8 h 21 mindaylight on December 21

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

Precipitation22.9 inper year, rain and melted snow

Snowfall44 inper year; 105 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: Warren Wsd, MN (2 mi away); precipitation: Argyle, MN (12 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.

East Grand Forks, MN · 17 mi

567383b

Newfolden, MN · 22 mi

567574a

Stephen, MN · 23 mi

567583b

Strandquist, MN · 23 mi

Minnesota planting zones →

Questions about 56762

What planting zone is ZIP code 56762?

ZIP code 56762 (Warren, MN) is in USDA hardiness zone 4a on the 2023 map: the coldest night of an average winter reaches −30 to −25 °F (−34.4 to −31.7 °C).

When is the last frost in Warren, MN?

The median last spring frost (32 °F) near 56762 is May 5; after May 22 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Warren Wsd station.

When is the first frost in Warren, MN?

The median first fall frost near 56762 is October 2, giving a median frost-free growing season of 147 days.

When should I plant tomatoes in 56762?

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

How much rain and snow does 56762 get?

About 22.9 inches of precipitation a year and 44 inches of snowfall (NOAA 1991–2020 normals, Argyle station).

How hot do summers get in Warren, MN?

The average high peaks at 81 °F in July, with about 6 days a year at 90 °F or more.

What kind of soil does 56762 have?

The USDA soil survey maps Wheatville at the center of ZIP 56762: very fine sandy loam, somewhat poorly drained, pH about 7.8 (slightly alkaline).

Did spring come early in Warren, MN in 2026?

Spring leaf-out near 56762 came on Apr 26 in 2026, about the same as the 1991–2020 average (Apr 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Warren, MN?

Long-day onions: the longest day near 56762 is 16 h 04 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 56762 change?

Yes. The 2012 USDA map put 56762 in zone 3b; the 2023 map puts it in zone 4a. The newer map uses 1991–2020 data and more weather stations.