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

Planting zone for 57601 — Mobridge, SD

ZIP code 57601 (Mobridge, Walworth 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 4.

Where ZIP 57601 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 4
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 Mobridge, 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 Mobridge, SD

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 20only 10% chance of frost after
First fall frostOctober 4median — 10% chance by Sep 21
Growing season150 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 28 and returns around October 12.

From the NOAA station Mobridge Municipal Airport, SD — 14 miles away, elevation 1,716 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 57601

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 9 – Aug 23
GarlicPlant cloves · Sep 20 – Oct 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 5) and first fall frost (Oct 4) 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 57601 came on Mar 28 — 17 days earlier than the 1991–2020 average (Apr 14).

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.

Trees 23

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °Fbalsam poplar80 ft · blooms late spring · high shade tolerance · to −79 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblack maple100 ft · blooms late spring · low shade tolerance · to −47 °Fblack walnut100 ft · blooms late spring · high shade tolerance · to −28 °F

Shrubs 65

alderleaf buckthorn3 ft · blooms late spring · low shade tolerance · to −33 °Falderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °FAmerican black currant3 ft · blooms early spring · to −46 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °Fbeaked hazelnut15 ft · blooms early spring · low shade tolerance · to −47 °F

Wildflowers & perennials 191

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °Falpine sweetvetch2 ft · blooms early summer · high shade tolerance · to −62 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °F

Grasses 138

Alaska oniongrass3 ft · blooms mid spring · low shade tolerance · to −33 °Falkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Farctic brome3 ft · blooms early summer · low shade tolerance · to −33 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °F

Vines 5

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Friverbank grape45 ft · blooms late spring · medium shade tolerance · to −33 °FVirginia creeper1 ft · blooms late spring · medium shade tolerance · to −28 °Fwestern white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °F

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 Mobridge, SD.

Soil in Mobridge, SD

The soil mapped at the center of ZIP 57601 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 clays, 9 to 25 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 57601; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mobridge, SD

Summer high87 °Faverage high, July
Winter low6 °Faverage low, January
Hot days29days a year at 90 °F or more
Freezing nights171nights a year at 32 °F or less
Growing degree days2,857base 50 °F — the season’s usable heat
Longest day15 h 40 mindaylight on June 21
Shortest day8 h 43 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation18 inper year, rain and melted snow
Snowfall31 inper year; 65 days with snow on the ground

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 27 °F, low 6 °F 27°6° JanFebruary: average high 32 °F, low 11 °F 32°11° FebMarch: average high 45 °F, low 22 °F 45°22° MarApril: average high 59 °F, low 33 °F 59°33° AprMay: average high 70 °F, low 45 °F 70°45° MayJune: average high 80 °F, low 56 °F 80°56° JunJuly: average high 87 °F, low 62 °F 87°62° JulAugust: average high 86 °F, low 60 °F 86°60° AugSeptember: average high 77 °F, low 50 °F 77°50° SepOctober: average high 60 °F, low 37 °F 60°37° OctNovember: average high 44 °F, low 23 °F 44°23° NovDecember: average high 32 °F, low 12 °F 32°12° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 0.38 in precipitation, 6.3 in snowfall 0.4❄6 JanFebruary: 0.65 in precipitation, 6.4 in snowfall 0.7❄6 FebMarch: 0.71 in precipitation, 4.1 in snowfall 0.7❄4 MarApril: 1.58 in precipitation, 3.2 in snowfall 1.6❄3 AprMay: 2.94 in precipitation 2.9 MayJune: 3.08 in precipitation 3.1 JunJuly: 2.33 in precipitation 2.3 JulAugust: 2.05 in precipitation 2.0 AugSeptember: 1.52 in precipitation 1.5 SepOctober: 1.81 in precipitation, 1.7 in snowfall 1.8❄2 OctNovember: 0.43 in precipitation, 3.6 in snowfall 0.4❄4 NovDecember: 0.51 in precipitation, 5.7 in snowfall 0.5❄6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Mobridge Municipal Airport, SD (14 mi away); precipitation: Mobridge Municipal Airport, SD (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4b.

574204b
Akaska, SD · 11 mi
574724b
Selby, SD · 14 mi
576314b
Glenham, SD · 18 mi
576524b
Ridgeview, SD · 21 mi
574424b
Gettysburg, SD · 22 mi
576304b
Glencross, SD · 23 mi
576574b
Trail City, SD · 24 mi
576584b
Wakpala, SD · 25 mi

South Dakota planting zones →

Questions about 57601

What planting zone is ZIP code 57601?

ZIP code 57601 (Mobridge, 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 Mobridge, SD?

The median last spring frost (32 °F) near 57601 is May 5; after May 20 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Mobridge Municipal Airport station.

When is the first frost in Mobridge, SD?

The median first fall frost near 57601 is October 4, giving a median frost-free growing season of 150 days.

When should I plant tomatoes in 57601?

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 57601 get?

About 18 inches of precipitation a year and 31 inches of snowfall (NOAA 1991–2020 normals, Mobridge Municipal Airport station).

How hot do summers get in Mobridge, SD?

The average high peaks at 87 °F in July, with about 29 days a year at 90 °F or more.

What kind of soil does 57601 have?

The USDA soil survey maps Sansarc at the center of ZIP 57601: clay, well drained, pH about 7.6 (slightly alkaline).

Did spring come early in Mobridge, SD in 2026?

Spring leaf-out near 57601 came on Mar 28 in 2026, 17 days earlier than the 1991–2020 average (Apr 14), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mobridge, SD?

Long-day onions: the longest day near 57601 is 15 h 40 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).