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

Planting zone for 57566 — Parmelee, SD

ZIP code 57566 (Parmelee, Todd County) is in USDA zone 5a: the coldest winter night averages −20 to −15 °F. The median last spring frost is May 11 and the first fall frost October 1.

Where ZIP 57566 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 11

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 Parmelee, 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 Parmelee, SD

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMay 11median — 50% chance of a later frost

Safe for tender plantsMay 24only 10% chance of frost after

First fall frostOctober 1median — 10% chance by Sep 18

Growing season143 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 1 and returns around October 10.

From the NOAA station Harrington, SD — 13 miles away, elevation 2,979 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 57566

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 30 – Apr 13

SpinachSow outdoors · Mar 30 – Apr 20

Broccoli, cabbageStart indoors · Mar 2 – Mar 16

Broccoli, cabbageTransplant · Apr 20 – May 4

Onion setsPlant outdoors · Apr 13 – Apr 27

PotatoesPlant outdoors · Apr 20 – May 4

LettuceSow outdoors · Apr 13 – Apr 27

Carrots, beetsSow outdoors · Apr 20 – May 4

TomatoesStart indoors · Mar 16 – Mar 30

TomatoesTransplant · May 18 – Jun 1

Peppers, eggplantStart indoors · Mar 2 – Mar 16

Peppers, eggplantTransplant · May 25 – Jun 8

BeansSow outdoors · May 18 – Jun 1

Sweet cornSow outdoors · May 18 – Jun 1

Cucumbers, squashSow outdoors · May 18 – Jun 1

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 11) 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 57566 came on Mar 8 — 25 days earlier than the 1991–2020 average (Apr 2).

average
Apr 22026
Mar 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).

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.

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 Parmelee, SD.

Soil in Parmelee, SD

The soil mapped at the center of ZIP 57566 is Keota — silt loam, well drained.

TextureSilt loama good balance for most vegetables

pH7.8slightly alkaline; 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: Keota-Epping silt loams, 9 to 21 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 57566; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Parmelee, SD

Summer high87 °Faverage high, July

Winter low12 °Faverage low, January

Hot days32days a year at 90 °F or more

Freezing nights171nights a year at 32 °F or less

Growing degree days2,717base 50 °F — the season’s usable heat

Longest day15 h 24 mindaylight on June 21

Shortest day8 h 58 mindaylight on December 21

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

Precipitation21.9 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Harrington, SD (13 mi away); precipitation: Norris 2.0 Ssw, SD (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 5a.

Saint Francis, SD · 12 mi

575745a

Tuthill, SD · 20 mi

575475a

Long Valley, SD · 21 mi

575555a

Mission, SD · 21 mi

575795a

White River, SD · 24 mi

692165a

Kilgore, NE · 25 mi

South Dakota planting zones →

Questions about 57566

What planting zone is ZIP code 57566?

ZIP code 57566 (Parmelee, 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 Parmelee, SD?

The median last spring frost (32 °F) near 57566 is May 11; after May 24 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Harrington station.

When is the first frost in Parmelee, SD?

The median first fall frost near 57566 is October 1, giving a median frost-free growing season of 143 days.

When should I plant tomatoes in 57566?

Start tomato seeds indoors around Mar 16 – Mar 30 and set transplants outside around May 18 – Jun 1, one to three weeks after the median last frost.

How much rain and snow does 57566 get?

About 21.9 inches of precipitation a year (NOAA 1991–2020 normals, Norris 2.0 Ssw station).

How hot do summers get in Parmelee, SD?

The average high peaks at 87 °F in July, with about 32 days a year at 90 °F or more.

What kind of soil does 57566 have?

The USDA soil survey maps Keota at the center of ZIP 57566: silt loam, well drained, pH about 7.8 (slightly alkaline).

Did spring come early in Parmelee, SD in 2026?

Spring leaf-out near 57566 came on Mar 8 in 2026, 25 days earlier than the 1991–2020 average (Apr 2), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Parmelee, SD?

Long-day onions: the longest day near 57566 is 15 h 24 min, so summer days reach 15+ hours, enough for long-day varieties (intermediate types work too).

Did the zone for 57566 change?

Yes. The 2012 USDA map put 57566 in zone 4b; the 2023 map puts it in zone 5a. The newer map uses 1991–2020 data and more weather stations.