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

Planting zone for 57232 — Eden, SD

ZIP code 57232 (Eden, Marshall County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 2 and the first fall frost October 9.

Where ZIP 57232 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 2

First frostOct 9

2012 zone4a

Was 4a 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 4b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Eden, SD…

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 Eden, SD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 2median — 50% chance of a later frost

Safe for tender plantsMay 15only 10% chance of frost after

First fall frostOctober 9median — 10% chance by Sep 27

Growing season160 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 24 and returns around October 20.

From the NOAA station Roy Lake, SD — 6 miles away, elevation 1,811 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 57232

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 21 – Apr 4

SpinachSow outdoors · Mar 21 – Apr 11

Broccoli, cabbageStart indoors · Feb 21 – Mar 7

Broccoli, cabbageTransplant · Apr 11 – Apr 25

Onion setsPlant outdoors · Apr 4 – Apr 18

PotatoesPlant outdoors · Apr 11 – Apr 25

LettuceSow outdoors · Apr 4 – Apr 18

Carrots, beetsSow outdoors · Apr 11 – Apr 25

TomatoesStart indoors · Mar 7 – Mar 21

TomatoesTransplant · May 9 – May 23

Peppers, eggplantStart indoors · Feb 21 – Mar 7

Peppers, eggplantTransplant · May 16 – May 30

BeansSow outdoors · May 9 – May 23

Sweet cornSow outdoors · May 9 – May 23

Cucumbers, squashSow outdoors · May 9 – May 23

Fall lettuce, spinachSow outdoors · Aug 14 – Aug 28

GarlicPlant cloves · Sep 25 – Oct 30

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 2) and first fall frost (Oct 9) 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 57232 came on Apr 21 — about the same time as the 1991–2020 average (Apr 23).

average
Apr 232026
Apr 21

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 Eden, SD

The soil mapped at the center of ZIP 57232 is Forman — loam, well drained.

TextureLoama good balance for most vegetables

pH6.8neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Forman-Poinsett complex, 6 to 9 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 57232; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Eden, SD

Summer high82 °Faverage high, July

Winter low3 °Faverage low, January

Hot days4days a year at 90 °F or more

Freezing nights174nights a year at 32 °F or less

Growing degree days2,541base 50 °F — the season’s usable heat

Longest day15 h 42 mindaylight on June 21

Shortest day8 h 41 mindaylight on December 21

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

Precipitation25 inper year, rain and melted snow

Snowfall48 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Roy Lake, SD (6 mi away); precipitation: Roy Lake, SD (6 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.

Claire City, SD · 18 mi

South Dakota planting zones →

Questions about 57232

What planting zone is ZIP code 57232?

ZIP code 57232 (Eden, SD) 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 Eden, SD?

The median last spring frost (32 °F) near 57232 is May 2; after May 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Roy Lake station.

When is the first frost in Eden, SD?

The median first fall frost near 57232 is October 9, giving a median frost-free growing season of 160 days.

When should I plant tomatoes in 57232?

Start tomato seeds indoors around Mar 7 – Mar 21 and set transplants outside around May 9 – May 23, one to three weeks after the median last frost.

How much rain and snow does 57232 get?

About 25 inches of precipitation a year and 48 inches of snowfall (NOAA 1991–2020 normals, Roy Lake station).

How hot do summers get in Eden, SD?

The average high peaks at 82 °F in July, with about 4 days a year at 90 °F or more.

What kind of soil does 57232 have?

The USDA soil survey maps Forman at the center of ZIP 57232: loam, well drained, pH about 6.8 (neutral).

Did spring come early in Eden, SD in 2026?

Spring leaf-out near 57232 came on Apr 21 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 Eden, SD?

Long-day onions: the longest day near 57232 is 15 h 42 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 57232 change?

Yes. The 2012 USDA map put 57232 in zone 4a; the 2023 map puts it in zone 4b. The newer map uses 1991–2020 data and more weather stations.