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

Planting zone for 57737 — Enning, SD

ZIP code 57737 (Enning, Meade County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 16 and the first fall frost September 26.

Where ZIP 57737 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 16
First frostSep 26
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 Enning, 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 Enning, SD

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 16median — 50% chance of a later frost
Safe for tender plantsMay 27only 10% chance of frost after
First fall frostSeptember 26median — 10% chance by Sep 11
Growing season131 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 6 and returns around October 3.

From the NOAA station Red Owl, SD — 10 miles away, elevation 2,772 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 57737

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Apr 4 – Apr 18
SpinachSow outdoors · Apr 4 – Apr 25
Broccoli, cabbageStart indoors · Mar 7 – Mar 21
Broccoli, cabbageTransplant · Apr 25 – May 9
Onion setsPlant outdoors · Apr 18 – May 2
PotatoesPlant outdoors · Apr 25 – May 9
LettuceSow outdoors · Apr 18 – May 2
Carrots, beetsSow outdoors · Apr 25 – May 9
TomatoesStart indoors · Mar 21 – Apr 4
TomatoesTransplant · May 23 – Jun 6
Peppers, eggplantStart indoors · Mar 7 – Mar 21
Peppers, eggplantTransplant · May 30 – Jun 13
BeansSow outdoors · May 23 – Jun 6
Sweet cornSow outdoors · May 23 – Jun 6
Cucumbers, squashSow outdoors · May 23 – Jun 6
Fall lettuce, spinachSow outdoors · Aug 1 – Aug 15
GarlicPlant cloves · Sep 12 – Oct 17
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 16) and first fall frost (Sep 26) 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 57737 came on Mar 17 — 23 days earlier than the 1991–2020 average (Apr 9).

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 Enning, SD.

Soil in Enning, SD

The soil mapped at the center of ZIP 57737 is Assinniboine — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.1neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter3%moderate
Hydrologic groupBwater soaks in moderately
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Assinniboine fine sandy loam, 2 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 57737; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Enning, SD

Summer high85 °Faverage high, July
Winter low9 °Faverage low, January
Hot days26days a year at 90 °F or more
Freezing nights186nights a year at 32 °F or less
Growing degree days2,297base 50 °F — the season’s usable heat
Longest day15 h 33 mindaylight on June 21
Shortest day8 h 49 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation18.9 inper year, rain and melted snow
Snowfall48 inper year

Average high and low, by month

0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 32 °F, low 9 °F 32°9° JanFebruary: average high 35 °F, low 11 °F 35°11° FebMarch: average high 45 °F, low 20 °F 45°20° MarApril: average high 56 °F, low 30 °F 56°30° AprMay: average high 66 °F, low 41 °F 66°41° MayJune: average high 77 °F, low 51 °F 77°51° JunJuly: average high 85 °F, low 57 °F 85°57° JulAugust: average high 85 °F, low 54 °F 85°54° AugSeptember: average high 75 °F, low 44 °F 75°44° SepOctober: average high 60 °F, low 32 °F 60°32° OctNovember: average high 46 °F, low 20 °F 46°20° NovDecember: average high 35 °F, low 11 °F 35°11° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 0.41 in precipitation, 5 in snowfall 0.4❄5 JanFebruary: 0.52 in precipitation, 6.7 in snowfall 0.5❄7 FebMarch: 0.95 in precipitation, 8.3 in snowfall 0.9❄8 MarApril: 1.98 in precipitation, 7.5 in snowfall 2.0❄8 AprMay: 3.69 in precipitation, 1.7 in snowfall 3.7❄2 MayJune: 3.13 in precipitation 3.1 JunJuly: 2.46 in precipitation 2.5 JulAugust: 1.63 in precipitation 1.6 AugSeptember: 1.29 in precipitation 1.3 SepOctober: 1.61 in precipitation, 3 in snowfall 1.6❄3 OctNovember: 0.61 in precipitation, 6.2 in snowfall 0.6❄6 NovDecember: 0.59 in precipitation, 9.1 in snowfall 0.6❄9 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Red Owl, SD (10 mi away); precipitation: Red Owl, SD (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

577924b
White Owl, SD · 8 mi
577874b
Union Center, SD · 10 mi
577914b
Wasta, SD · 22 mi
577484b
Howes, SD · 25 mi
577615a
New Underwood, SD · 26 mi
577675a
Owanka, SD · 29 mi
577584b
Mud Butte, SD · 32 mi
577195a
Box Elder, SD · 33 mi

South Dakota planting zones →

Questions about 57737

What planting zone is ZIP code 57737?

ZIP code 57737 (Enning, 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 Enning, SD?

The median last spring frost (32 °F) near 57737 is May 16; after May 27 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Red Owl station.

When is the first frost in Enning, SD?

The median first fall frost near 57737 is September 26, giving a median frost-free growing season of 131 days.

When should I plant tomatoes in 57737?

Start tomato seeds indoors around Mar 21 – Apr 4 and set transplants outside around May 23 – Jun 6, one to three weeks after the median last frost.

How much rain and snow does 57737 get?

About 18.9 inches of precipitation a year and 48 inches of snowfall (NOAA 1991–2020 normals, Red Owl station).

How hot do summers get in Enning, SD?

The average high peaks at 85 °F in July, with about 26 days a year at 90 °F or more.

What kind of soil does 57737 have?

The USDA soil survey maps Assinniboine at the center of ZIP 57737: fine sandy loam, well drained, pH about 7.1 (neutral).

Did spring come early in Enning, SD in 2026?

Spring leaf-out near 57737 came on Mar 17 in 2026, 23 days earlier than the 1991–2020 average (Apr 9), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Enning, SD?

Long-day onions: the longest day near 57737 is 15 h 33 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).