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

Planting zone for 56573 — Perham, MN

ZIP code 56573 (Perham, Otter Tail County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 10 and the first fall frost September 29.

Where ZIP 56573 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 10

First frostSep 29

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 Perham, 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 Perham, MN

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 10median — 50% chance of a later frost

Safe for tender plantsMay 24only 10% chance of frost after

First fall frostSeptember 29median — 10% chance by Sep 17

Growing season141 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 1 and returns around October 10.

From the NOAA station New York Mills, MN — 9 miles away, elevation 1,408 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 56573

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 29 – Apr 12

SpinachSow outdoors · Mar 29 – Apr 19

Broccoli, cabbageStart indoors · Mar 1 – Mar 15

Broccoli, cabbageTransplant · Apr 19 – May 3

Onion setsPlant outdoors · Apr 12 – Apr 26

PotatoesPlant outdoors · Apr 19 – May 3

LettuceSow outdoors · Apr 12 – Apr 26

Carrots, beetsSow outdoors · Apr 19 – May 3

TomatoesStart indoors · Mar 15 – Mar 29

TomatoesTransplant · May 17 – May 31

Peppers, eggplantStart indoors · Mar 1 – Mar 15

Peppers, eggplantTransplant · May 24 – Jun 7

BeansSow outdoors · May 17 – May 31

Sweet cornSow outdoors · May 17 – May 31

Cucumbers, squashSow outdoors · May 17 – May 31

Fall lettuce, spinachSow outdoors · Aug 4 – Aug 18

GarlicPlant cloves · Sep 15 – Oct 20

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 10) and first fall frost (Sep 29) 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 56573 came on Apr 22 — about the same time as the 1991–2020 average (Apr 23).

average
Apr 232026
Apr 22

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 Perham, MN.

Soil in Perham, MN

The soil mapped at the center of ZIP 56573 is Hubbard — loamy sand, excessively drained.

TextureLoamy sanddrains and warms fast; dries out and needs more feeding

pH6.0slightly acidic; most vegetables like 6.0–7.0

DrainageExcessively drainednatural drainage class

Organic matter1.8%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Hubbard loamy sand, 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 56573; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Perham, MN

Summer high79 °Faverage high, July

Winter low−2 °Faverage low, January

Hot days3days a year at 90 °F or more

Freezing nights184nights a year at 32 °F or less

Growing degree days1,948base 50 °F — the season’s usable heat

Longest day15 h 50 mindaylight on June 21

Shortest day8 h 33 mindaylight on December 21

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

Precipitation26.9 inper year, rain and melted snow

Snowfall46 inper year; 124 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: New York Mills, MN (9 mi away); precipitation: New York Mills, MN (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

565674a

New York Mills, MN · 9 mi

565444a

Frazee, MN · 11 mi

565714a

Ottertail, MN · 12 mi

565764a

Richville, MN · 13 mi

Wolf Lake, MN · 16 mi

565184a

Bluffton, MN · 16 mi

Minnesota planting zones →

Questions about 56573

What planting zone is ZIP code 56573?

ZIP code 56573 (Perham, 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 Perham, MN?

The median last spring frost (32 °F) near 56573 is May 10; after May 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, New York Mills station.

When is the first frost in Perham, MN?

The median first fall frost near 56573 is September 29, giving a median frost-free growing season of 141 days.

When should I plant tomatoes in 56573?

Start tomato seeds indoors around Mar 15 – Mar 29 and set transplants outside around May 17 – May 31, one to three weeks after the median last frost.

How much rain and snow does 56573 get?

About 26.9 inches of precipitation a year and 46 inches of snowfall (NOAA 1991–2020 normals, New York Mills station).

How hot do summers get in Perham, MN?

The average high peaks at 79 °F in July, with about 3 days a year at 90 °F or more.

What kind of soil does 56573 have?

The USDA soil survey maps Hubbard at the center of ZIP 56573: loamy sand, excessively drained, pH about 6.0 (slightly acidic).

Did spring come early in Perham, MN in 2026?

Spring leaf-out near 56573 came on Apr 22 in 2026, about the same as the 1991–2020 average (Apr 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Perham, MN?

Long-day onions: the longest day near 56573 is 15 h 50 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 56573 change?

Yes. The 2012 USDA map put 56573 in zone 3b; the 2023 map puts it in zone 4a. The newer map uses 1991–2020 data and more weather stations.