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

Planting zone for 57018 — Colton, SD

ZIP code 57018 (Colton, Minnehaha 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 4.

Where ZIP 57018 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 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 Colton, 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 Colton, 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 4median — 10% chance by Sep 21

Growing season153 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 23 and returns around October 14.

From the NOAA station Montrose 8n, SD — 11 miles away, elevation 1,719 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 57018

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 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 3) 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 57018 came on Mar 25 — 21 days earlier than the 1991–2020 average (Apr 15).

average
Apr 152026
Mar 25

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 Colton, SD.

Soil in Colton, SD

The soil mapped at the center of ZIP 57018 is Egan — silty clay loam, well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up

pH6.0slightly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter6%high

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Egan-Wentworth-Trent complex, 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 57018; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Colton, SD

Summer high84 °Faverage high, July

Winter low6 °Faverage low, January

Hot days22days a year at 90 °F or more

Freezing nights163nights a year at 32 °F or less

Growing degree days2,672base 50 °F — the season’s usable heat

Longest day15 h 28 mindaylight on June 21

Shortest day8 h 54 mindaylight on December 21

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

Precipitation27.9 inper year, rain and melted snow

Snowfall40 inper year; 71 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: Montrose 8n, SD (11 mi away); precipitation: Colton, SD (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

Sioux Falls, SD · 13 mi

571185a

Sioux Falls, SD · 13 mi

South Dakota planting zones →

Questions about 57018

What planting zone is ZIP code 57018?

ZIP code 57018 (Colton, 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 Colton, SD?

The median last spring frost (32 °F) near 57018 is May 3; after May 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Montrose 8n station.

When is the first frost in Colton, SD?

The median first fall frost near 57018 is October 4, giving a median frost-free growing season of 153 days.

When should I plant tomatoes in 57018?

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 57018 get?

About 27.9 inches of precipitation a year and 40 inches of snowfall (NOAA 1991–2020 normals, Colton station).

How hot do summers get in Colton, SD?

The average high peaks at 84 °F in July, with about 22 days a year at 90 °F or more.

What kind of soil does 57018 have?

The USDA soil survey maps Egan at the center of ZIP 57018: silty clay loam, well drained, pH about 6.0 (slightly acidic).

Did spring come early in Colton, SD in 2026?

Spring leaf-out near 57018 came on Mar 25 in 2026, 21 days earlier than the 1991–2020 average (Apr 15), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Colton, SD?

Long-day onions: the longest day near 57018 is 15 h 28 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).