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

Planting zone for 55087 — Warsaw, MN

ZIP code 55087 (Warsaw, Rice County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 5 and the first fall frost October 5.

Where ZIP 55087 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 5

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 Warsaw, 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 Warsaw, 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 19only 10% chance of frost after

First fall frostOctober 5median — 10% chance by Sep 21

Growing season152 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 26 and returns around October 13.

From the NOAA station Faribault, MN — 9 miles away, elevation 971 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 55087

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 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 5) 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 55087 came on Apr 5 — 11 days earlier than the 1991–2020 average (Apr 16).

average
Apr 162026
Apr 5

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).

Soil in Warsaw, MN

The soil mapped at the center of ZIP 55087 is Nicollet — clay loam, somewhat poorly drained.

TextureClay loamholds water and nutrients; slow to drain and warm up

pH6.2slightly acidic; most vegetables like 6.0–7.0

DrainageSomewhat poorly drainedconsider raised beds

Organic matter6%high

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classprime farmlandUSDA classification

Map unit: Nicollet clay loam, 1 to 3 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 55087; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Warsaw, MN

Summer high82 °Faverage high, July

Winter low5 °Faverage low, January

Hot days9days a year at 90 °F or more

Freezing nights168nights a year at 32 °F or less

Growing degree days2,529base 50 °F — the season’s usable heat

Longest day15 h 31 mindaylight on June 21

Shortest day8 h 51 mindaylight on December 21

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

Precipitation35.5 inper year, rain and melted snow

Snowfall43 inper year; 90 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: Faribault, MN (9 mi away); precipitation: Faribault, MN (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4b.

550524b

Morristown, MN · 2 mi

Waterville, MN · 10 mi

Montgomery, MN · 14 mi

550464b

Lonsdale, MN · 14 mi

Minnesota planting zones →

Questions about 55087

What planting zone is ZIP code 55087?

ZIP code 55087 (Warsaw, 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 Warsaw, MN?

The median last spring frost (32 °F) near 55087 is May 5; after May 19 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Faribault station.

When is the first frost in Warsaw, MN?

The median first fall frost near 55087 is October 5, giving a median frost-free growing season of 152 days.

When should I plant tomatoes in 55087?

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 55087 get?

About 35.5 inches of precipitation a year and 43 inches of snowfall (NOAA 1991–2020 normals, Faribault station).

How hot do summers get in Warsaw, MN?

The average high peaks at 82 °F in July, with about 9 days a year at 90 °F or more.

What kind of soil does 55087 have?

The USDA soil survey maps Nicollet at the center of ZIP 55087: clay loam, somewhat poorly drained, pH about 6.2 (slightly acidic).

Did spring come early in Warsaw, MN in 2026?

Spring leaf-out near 55087 came on Apr 5 in 2026, 11 days earlier than the 1991–2020 average (Apr 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Warsaw, MN?

Long-day onions: the longest day near 55087 is 15 h 31 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).