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

Planting zone for 57260 — Rosholt, SD

ZIP code 57260 (Rosholt, Roberts 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 3.

Where ZIP 57260 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 3

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 Rosholt, 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 Rosholt, 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 15only 10% chance of frost after

First fall frostOctober 3median — 10% chance by Sep 22

Growing season154 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 23 and returns around October 13.

From the NOAA station White Rock Dam, MN — 7 miles away, elevation 1,024 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 57260

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 8 – Aug 22

GarlicPlant cloves · Sep 19 – Oct 24

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 3) and first fall frost (Oct 3) 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 57260 came on Apr 18 — about the same time as the 1991–2020 average (Apr 20).

average
Apr 202026
Apr 18

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 Rosholt, SD.

Soil in Rosholt, SD

The soil mapped at the center of ZIP 57260 is Heimdal — loam, well drained.

TextureLoama good balance for most vegetables

pH6.7neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter4.5%moderate

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Heimdal-Svea loams, 2 to 6 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 57260; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Rosholt, SD

Summer high82 °Faverage high, July

Winter low1 °Faverage low, January

Hot days10days a year at 90 °F or more

Freezing nights174nights a year at 32 °F or less

Growing degree days2,462base 50 °F — the season’s usable heat

Longest day15 h 44 mindaylight on June 21

Shortest day8 h 39 mindaylight on December 21

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

Precipitation24.5 inper year, rain and melted snow

Snowfall36 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: White Rock Dam, MN (7 mi away); precipitation: White Rock Dam, MN (7 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.

572554b

New Effington, SD · 11 mi

562964b

Wheaton, MN · 12 mi

580304a

Fairmount, ND · 13 mi

580414b

Hankinson, ND · 16 mi

562114b

Beardsley, MN · 17 mi

562194b

Browns Valley, MN · 18 mi

South Dakota planting zones →

Questions about 57260

What planting zone is ZIP code 57260?

ZIP code 57260 (Rosholt, 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 Rosholt, SD?

The median last spring frost (32 °F) near 57260 is May 3; after May 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, White Rock Dam station.

When is the first frost in Rosholt, SD?

The median first fall frost near 57260 is October 3, giving a median frost-free growing season of 154 days.

When should I plant tomatoes in 57260?

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 57260 get?

About 24.5 inches of precipitation a year and 36 inches of snowfall (NOAA 1991–2020 normals, White Rock Dam station).

How hot do summers get in Rosholt, SD?

The average high peaks at 82 °F in July, with about 10 days a year at 90 °F or more.

What kind of soil does 57260 have?

The USDA soil survey maps Heimdal at the center of ZIP 57260: loam, well drained, pH about 6.7 (neutral).

Did spring come early in Rosholt, SD in 2026?

Spring leaf-out near 57260 came on Apr 18 in 2026, about the same as the 1991–2020 average (Apr 20), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Rosholt, SD?

Long-day onions: the longest day near 57260 is 15 h 44 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 57260 change?

Yes. The 2012 USDA map put 57260 in zone 4a; the 2023 map puts it in zone 4b. The newer map uses 1991–2020 data and more weather stations.