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

Planting zone for 57658 — Wakpala, SD

ZIP code 57658 (Wakpala, Corson County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 3 and the first fall frost October 8.

Where ZIP 57658 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 3

First frostOct 8

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 Wakpala, 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 Wakpala, SD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 3median — 50% chance of a later frost

Safe for tender plantsMay 16only 10% chance of frost after

First fall frostOctober 8median — 10% chance by Sep 25

Growing season157 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 25 and returns around October 17.

From the NOAA station Mobridge 2nnw, SD — 9 miles away, elevation 1,693 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 57658

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 22 – Apr 5

SpinachSow outdoors · Mar 22 – Apr 12

Broccoli, cabbageStart indoors · Feb 22 – Mar 8

Broccoli, cabbageTransplant · Apr 12 – Apr 26

Onion setsPlant outdoors · Apr 5 – Apr 19

PotatoesPlant outdoors · Apr 12 – Apr 26

LettuceSow outdoors · Apr 5 – Apr 19

Carrots, beetsSow outdoors · Apr 12 – Apr 26

TomatoesStart indoors · Mar 8 – Mar 22

TomatoesTransplant · May 10 – May 24

Peppers, eggplantStart indoors · Feb 22 – Mar 8

Peppers, eggplantTransplant · May 17 – May 31

BeansSow outdoors · May 10 – May 24

Sweet cornSow outdoors · May 10 – May 24

Cucumbers, squashSow outdoors · May 10 – May 24

Fall lettuce, spinachSow outdoors · Aug 13 – Aug 27

GarlicPlant cloves · Sep 24 – Oct 29

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 3) and first fall frost (Oct 8) 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 57658 came on Apr 7 — 9 days earlier than the 1991–2020 average (Apr 16).

average
Apr 162026
Apr 7

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 4b in South Dakota

430 plants native to the lower 48 states, recorded in South Dakota, and rated by the USDA to survive −25 °F or colder — the bottom of zone 4b. 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 Wakpala, SD.

Soil in Wakpala, SD

The soil mapped at the center of ZIP 57658 is Sansarc — clay, well drained.

TextureClayholds water and nutrients; slow to drain and warm up

pH7.6slightly alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.6%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Sansarc-Opal-Dupree clays, 9 to 25% 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 57658; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Wakpala, SD

Summer high85 °Faverage high, July

Winter low6 °Faverage low, January

Hot days21days a year at 90 °F or more

Freezing nights169nights a year at 32 °F or less

Growing degree days2,643base 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)

Precipitation17.3 inper year, rain and melted snow

Snowfall36 inper year; 76 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: Mobridge 2nnw, SD (9 mi away); precipitation: Mobridge 2nnw, SD (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

576424b

Mc Laughlin, SD · 11 mi

576394a

Little Eagle, SD · 12 mi

576314b

Glenham, SD · 14 mi

576574b

Trail City, SD · 15 mi

576484a

Pollock, SD · 21 mi

576464b

Mound City, SD · 24 mi

South Dakota planting zones →

Questions about 57658

What planting zone is ZIP code 57658?

ZIP code 57658 (Wakpala, 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 Wakpala, SD?

The median last spring frost (32 °F) near 57658 is May 3; after May 16 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mobridge 2nnw station.

When is the first frost in Wakpala, SD?

The median first fall frost near 57658 is October 8, giving a median frost-free growing season of 157 days.

When should I plant tomatoes in 57658?

Start tomato seeds indoors around Mar 8 – Mar 22 and set transplants outside around May 10 – May 24, one to three weeks after the median last frost.

How much rain and snow does 57658 get?

About 17.3 inches of precipitation a year and 36 inches of snowfall (NOAA 1991–2020 normals, Mobridge 2nnw station).

How hot do summers get in Wakpala, SD?

The average high peaks at 85 °F in July, with about 21 days a year at 90 °F or more.

What kind of soil does 57658 have?

The USDA soil survey maps Sansarc at the center of ZIP 57658: clay, well drained, pH about 7.6 (slightly alkaline).

Did spring come early in Wakpala, SD in 2026?

Spring leaf-out near 57658 came on Apr 7 in 2026, 9 days earlier than the 1991–2020 average (Apr 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Wakpala, SD?

Long-day onions: the longest day near 57658 is 15 h 42 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 57658 change?

Yes. The 2012 USDA map put 57658 in zone 4a; the 2023 map puts it in zone 4b. The newer map uses 1991–2020 data and more weather stations.