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

Planting zone for 57237 — Gary, SD

ZIP code 57237 (Gary, Deuel County) is in USDA zone 4b: the coldest winter night averages −25 to −20 °F. The median last spring frost is May 7 and the first fall frost October 1.

Where ZIP 57237 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 7

First frostOct 1

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 Gary, 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 Gary, SD

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostMay 7median — 50% chance of a later frost

Safe for tender plantsMay 21only 10% chance of frost after

First fall frostOctober 1median — 10% chance by Sep 19

Growing season146 daysfrost-free, median

A hard freeze (28 °F) usually ends around April 29 and returns around October 10.

From the NOAA station Clear Lake, SD — 9 miles away, elevation 1,811 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 57237

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 26 – Apr 9

SpinachSow outdoors · Mar 26 – Apr 16

Broccoli, cabbageStart indoors · Feb 26 – Mar 12

Broccoli, cabbageTransplant · Apr 16 – Apr 30

Onion setsPlant outdoors · Apr 9 – Apr 23

PotatoesPlant outdoors · Apr 16 – Apr 30

LettuceSow outdoors · Apr 9 – Apr 23

Carrots, beetsSow outdoors · Apr 16 – Apr 30

TomatoesStart indoors · Mar 12 – Mar 26

TomatoesTransplant · May 14 – May 28

Peppers, eggplantStart indoors · Feb 26 – Mar 12

Peppers, eggplantTransplant · May 21 – Jun 4

BeansSow outdoors · May 14 – May 28

Sweet cornSow outdoors · May 14 – May 28

Cucumbers, squashSow outdoors · May 14 – May 28

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 7) 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 57237 came on Apr 8 — 10 days earlier than the 1991–2020 average (Apr 18).

average
Apr 182026
Apr 8

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).

Soil in Gary, SD

The soil mapped at the center of ZIP 57237 is Forman — loam, well drained.

TextureLoama good balance for most vegetables

pH6.8neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Forman-Aastad loams, 1 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 57237; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Gary, SD

Summer high80 °Faverage high, July

Winter low2 °Faverage low, January

Hot days6days a year at 90 °F or more

Freezing nights171nights a year at 32 °F or less

Growing degree days2,274base 50 °F — the season’s usable heat

Longest day15 h 35 mindaylight on June 21

Shortest day8 h 47 mindaylight on December 21

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

Precipitation27.5 inper year, rain and melted snow

Snowfall61 inper year; 106 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: Clear Lake, SD (9 mi away); precipitation: Clear Lake, SD (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 4b.

572184b

Brandt, SD · 11 mi

572264b

Clear Lake, SD · 11 mi

South Dakota planting zones →

Questions about 57237

What planting zone is ZIP code 57237?

ZIP code 57237 (Gary, 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 Gary, SD?

The median last spring frost (32 °F) near 57237 is May 7; after May 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Clear Lake station.

When is the first frost in Gary, SD?

The median first fall frost near 57237 is October 1, giving a median frost-free growing season of 146 days.

When should I plant tomatoes in 57237?

Start tomato seeds indoors around Mar 12 – Mar 26 and set transplants outside around May 14 – May 28, one to three weeks after the median last frost.

How much rain and snow does 57237 get?

About 27.5 inches of precipitation a year and 61 inches of snowfall (NOAA 1991–2020 normals, Clear Lake station).

How hot do summers get in Gary, SD?

The average high peaks at 80 °F in July, with about 6 days a year at 90 °F or more.

What kind of soil does 57237 have?

The USDA soil survey maps Forman at the center of ZIP 57237: loam, well drained, pH about 6.8 (neutral).

Did spring come early in Gary, SD in 2026?

Spring leaf-out near 57237 came on Apr 8 in 2026, 10 days earlier than the 1991–2020 average (Apr 18), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Gary, SD?

Long-day onions: the longest day near 57237 is 15 h 35 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).