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

Planting zone for 57767 — Owanka, SD

ZIP code 57767 (Owanka, Pennington County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 10 and the first fall frost October 1.

Where ZIP 57767 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.

Zone5a−20 to −15 °F
Coldest night−28.9 to −26.1 °C
Last frostMay 10
First frostOct 1
2012 zone4b

Was 4b 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 5a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Owanka, 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 Owanka, SD

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 10median — 50% chance of a later frost
Safe for tender plantsMay 25only 10% chance of frost after
First fall frostOctober 1median — 10% chance by Sep 14
Growing season141 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 30 and returns around October 9.

From the NOAA station Wasta, SD — 7 miles away, elevation 2,330 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 57767

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 29 – Apr 12
SpinachSow outdoors · Mar 29 – Apr 19
Broccoli, cabbageStart indoors · Mar 1 – Mar 15
Broccoli, cabbageTransplant · Apr 19 – May 3
Onion setsPlant outdoors · Apr 12 – Apr 26
PotatoesPlant outdoors · Apr 19 – May 3
LettuceSow outdoors · Apr 12 – Apr 26
Carrots, beetsSow outdoors · Apr 19 – May 3
TomatoesStart indoors · Mar 15 – Mar 29
TomatoesTransplant · May 17 – May 31
Peppers, eggplantStart indoors · Mar 1 – Mar 15
Peppers, eggplantTransplant · May 24 – Jun 7
BeansSow outdoors · May 17 – May 31
Sweet cornSow outdoors · May 17 – May 31
Cucumbers, squashSow outdoors · May 17 – May 31
Fall lettuce, spinachSow outdoors · Aug 6 – Aug 20
GarlicPlant cloves · Sep 17 – Oct 22
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 10) and first fall frost (Oct 1) 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 57767 came on Mar 16 — 21 days earlier than the 1991–2020 average (Apr 6).

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 5a in South Dakota

452 plants native to the lower 48 states, recorded in South Dakota, and rated by the USDA to survive −20 °F or colder — the bottom of zone 5a. 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 70

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 202

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 144

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 Owanka, SD.

Soil in Owanka, SD

The soil mapped at the center of ZIP 57767 is Cushman — loam, well drained.

TextureLoama good balance for most vegetables
pH7.2neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter1.5%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Cushman-Shingle loams, 9 to 15 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 57767; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Owanka, SD

Summer high89 °Faverage high, July
Winter low9 °Faverage low, January
Hot days43days a year at 90 °F or more
Freezing nights175nights a year at 32 °F or less
Growing degree days2,854base 50 °F — the season’s usable heat
Longest day15 h 30 mindaylight on June 21
Shortest day8 h 52 mindaylight on December 21
Onions to growLong-daysummer days reach 15+ hours, enough for long-day varieties (intermediate types work too)
Precipitation17.6 inper year, rain and melted snow
Snowfall30 inper year; 46 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 35 °F, low 9 °F 35°9° JanFebruary: average high 39 °F, low 13 °F 39°13° FebMarch: average high 50 °F, low 22 °F 50°22° MarApril: average high 60 °F, low 33 °F 60°33° AprMay: average high 70 °F, low 44 °F 70°44° MayJune: average high 80 °F, low 54 °F 80°54° JunJuly: average high 89 °F, low 60 °F 89°60° JulAugust: average high 88 °F, low 58 °F 88°58° AugSeptember: average high 79 °F, low 47 °F 79°47° SepOctober: average high 63 °F, low 34 °F 63°34° OctNovember: average high 49 °F, low 21 °F 49°21° NovDecember: average high 37 °F, low 12 °F 37°12° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 0.28 in precipitation, 3.8 in snowfall 0.3❄4 JanFebruary: 0.53 in precipitation, 6.4 in snowfall 0.5❄6 FebMarch: 0.87 in precipitation, 5.5 in snowfall 0.9❄6 MarApril: 1.90 in precipitation, 3.7 in snowfall 1.9❄4 AprMay: 3.55 in precipitation, 0.1 in snowfall 3.5 MayJune: 2.73 in precipitation 2.7 JunJuly: 2.32 in precipitation 2.3 JulAugust: 1.56 in precipitation 1.6 AugSeptember: 1.19 in precipitation 1.2 SepOctober: 1.76 in precipitation, 1.1 in snowfall 1.8❄1 OctNovember: 0.64 in precipitation, 4.2 in snowfall 0.6❄4 NovDecember: 0.32 in precipitation, 5.6 in snowfall 0.3❄6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Wasta, SD (7 mi away); precipitation: Wasta, SD (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.

577914b
Wasta, SD · 9 mi
577615a
New Underwood, SD · 12 mi
577255a
Caputa, SD · 18 mi
577905a
Wall, SD · 19 mi
577195a
Box Elder, SD · 22 mi
577035a
Rapid City, SD · 25 mi
577805a
Scenic, SD · 26 mi
577065b
Ellsworth Afb, SD · 26 mi

South Dakota planting zones →

Questions about 57767

What planting zone is ZIP code 57767?

ZIP code 57767 (Owanka, SD) is in USDA hardiness zone 5a on the 2023 map: the coldest night of an average winter reaches −20 to −15 °F (−28.9 to −26.1 °C).

When is the last frost in Owanka, SD?

The median last spring frost (32 °F) near 57767 is May 10; after May 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Wasta station.

When is the first frost in Owanka, SD?

The median first fall frost near 57767 is October 1, giving a median frost-free growing season of 141 days.

When should I plant tomatoes in 57767?

Start tomato seeds indoors around Mar 15 – Mar 29 and set transplants outside around May 17 – May 31, one to three weeks after the median last frost.

How much rain and snow does 57767 get?

About 17.6 inches of precipitation a year and 30 inches of snowfall (NOAA 1991–2020 normals, Wasta station).

How hot do summers get in Owanka, SD?

The average high peaks at 89 °F in July, with about 43 days a year at 90 °F or more.

What kind of soil does 57767 have?

The USDA soil survey maps Cushman at the center of ZIP 57767: loam, well drained, pH about 7.2 (neutral).

Did spring come early in Owanka, SD in 2026?

Spring leaf-out near 57767 came on Mar 16 in 2026, 21 days earlier than the 1991–2020 average (Apr 6), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Owanka, SD?

Long-day onions: the longest day near 57767 is 15 h 30 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 57767 change?

Yes. The 2012 USDA map put 57767 in zone 4b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.