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

Planting zone for 57648 — Pollock, SD

ZIP code 57648 (Pollock, Campbell County) is in USDA zone 4a: the coldest winter night averages −30 to −25 °F. The median last spring frost is May 8 and the first fall frost September 30.

Where ZIP 57648 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.

Zone4a−30 to −25 °F
Coldest night−34.4 to −31.7 °C
Last frostMay 8
First frostSep 30
2012 zone4a

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 4a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Pollock, 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 Pollock, SD

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMay 8median — 50% chance of a later frost
Safe for tender plantsMay 21only 10% chance of frost after
First fall frostSeptember 30median — 10% chance by Sep 18
Growing season143 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 30 and returns around October 8.

From the NOAA station Pollock, SD — 2 miles away, elevation 1,641 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 57648

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Mar 27 – Apr 10
SpinachSow outdoors · Mar 27 – Apr 17
Broccoli, cabbageStart indoors · Feb 27 – Mar 13
Broccoli, cabbageTransplant · Apr 17 – May 1
Onion setsPlant outdoors · Apr 10 – Apr 24
PotatoesPlant outdoors · Apr 17 – May 1
LettuceSow outdoors · Apr 10 – Apr 24
Carrots, beetsSow outdoors · Apr 17 – May 1
TomatoesStart indoors · Mar 13 – Mar 27
TomatoesTransplant · May 15 – May 29
Peppers, eggplantStart indoors · Feb 27 – Mar 13
Peppers, eggplantTransplant · May 22 – Jun 5
BeansSow outdoors · May 15 – May 29
Sweet cornSow outdoors · May 15 – May 29
Cucumbers, squashSow outdoors · May 15 – May 29
Fall lettuce, spinachSow outdoors · Aug 5 – Aug 19
GarlicPlant cloves · Sep 16 – Oct 21
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (May 8) and first fall frost (Sep 30) 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 57648 came on Apr 8 — 8 days earlier than the 1991–2020 average (Apr 16).

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 4a in South Dakota

384 plants native to the lower 48 states, recorded in South Dakota, and rated by the USDA to survive −30 °F or colder — the bottom of zone 4a. Each links to its USDA PLANTS profile.

Trees 21

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 °Fboxelder60 ft · blooms early spring · low shade tolerance · to −46 °F

Shrubs 62

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 165

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 126

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 4

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 °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 Pollock, SD.

Soil in Pollock, SD

The soil mapped at the center of ZIP 57648 is Linton — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH7.2neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4.5%moderate
Hydrologic groupBwater soaks in moderately
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Linton-Sutley silt loams, 6 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 57648; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Pollock, SD

Summer high85 °Faverage high, July
Winter low3 °Faverage low, January
Hot days23days a year at 90 °F or more
Freezing nights176nights a year at 32 °F or less
Growing degree days2,581base 50 °F — the season’s usable heat
Longest day15 h 45 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)
Precipitation17.8 inper year, rain and melted snow
Snowfall39 inper year; 84 days with snow on the ground

Average high and low, by month

−10°0°10°20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 24 °F, low 3 °F 24°3° JanFebruary: average high 29 °F, low 8 °F 29°8° FebMarch: average high 42 °F, low 19 °F 42°19° MarApril: average high 58 °F, low 32 °F 58°32° AprMay: average high 70 °F, low 44 °F 70°44° MayJune: average high 79 °F, low 55 °F 79°55° JunJuly: average high 85 °F, low 60 °F 85°60° JulAugust: average high 84 °F, low 57 °F 84°57° AugSeptember: average high 75 °F, low 48 °F 75°48° SepOctober: average high 58 °F, low 34 °F 58°34° OctNovember: average high 41 °F, low 21 °F 41°21° NovDecember: average high 28 °F, low 9 °F 28°9° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″January: 0.37 in precipitation, 7.7 in snowfall 0.4❄8 JanFebruary: 0.46 in precipitation, 7.3 in snowfall 0.5❄7 FebMarch: 0.71 in precipitation, 5.5 in snowfall 0.7❄6 MarApril: 1.32 in precipitation, 4.2 in snowfall 1.3❄4 AprMay: 2.77 in precipitation, 0.2 in snowfall 2.8 MayJune: 3.21 in precipitation 3.2 JunJuly: 2.74 in precipitation 2.7 JulAugust: 2.18 in precipitation 2.2 AugSeptember: 1.54 in precipitation 1.5 SepOctober: 1.58 in precipitation, 1.6 in snowfall 1.6❄2 OctNovember: 0.49 in precipitation, 4.8 in snowfall 0.5❄5 NovDecember: 0.46 in precipitation, 7.7 in snowfall 0.5❄8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Pollock, SD (2 mi away); precipitation: Pollock, SD (2 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

585734a
Strasburg, ND · 15 mi
576324b
Herreid, SD · 15 mi
585424a
Hague, ND · 18 mi
585384a
Fort Yates, ND · 19 mi
576424b
Mc Laughlin, SD · 21 mi
576464b
Mound City, SD · 21 mi
576584b
Wakpala, SD · 21 mi
585524a
Linton, ND · 22 mi

South Dakota planting zones →

Questions about 57648

What planting zone is ZIP code 57648?

ZIP code 57648 (Pollock, SD) is in USDA hardiness zone 4a on the 2023 map: the coldest night of an average winter reaches −30 to −25 °F (−34.4 to −31.7 °C).

When is the last frost in Pollock, SD?

The median last spring frost (32 °F) near 57648 is May 8; after May 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Pollock station.

When is the first frost in Pollock, SD?

The median first fall frost near 57648 is September 30, giving a median frost-free growing season of 143 days.

When should I plant tomatoes in 57648?

Start tomato seeds indoors around Mar 13 – Mar 27 and set transplants outside around May 15 – May 29, one to three weeks after the median last frost.

How much rain and snow does 57648 get?

About 17.8 inches of precipitation a year and 39 inches of snowfall (NOAA 1991–2020 normals, Pollock station).

How hot do summers get in Pollock, SD?

The average high peaks at 85 °F in July, with about 23 days a year at 90 °F or more.

What kind of soil does 57648 have?

The USDA soil survey maps Linton at the center of ZIP 57648: silt loam, well drained, pH about 7.2 (neutral).

Did spring come early in Pollock, SD in 2026?

Spring leaf-out near 57648 came on Apr 8 in 2026, 8 days earlier than the 1991–2020 average (Apr 16), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Pollock, SD?

Long-day onions: the longest day near 57648 is 15 h 45 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).