Last and first frost dates in Sioux Falls

When is the last frost in Sioux Falls?

The last frost in Sioux Falls usually comes around 24 April: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 3 April, while corn waits until 1 May. The first autumn frost follows around 21 October, about 180 days later: harvest or cover frost-tender crops before then.

When to sow and plant

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

What planting zone is Sioux Falls?

The official USDA map (2023, 1991–2020 data) puts the centre of Sioux Falls (ZIP 57105) in zone 5a. Zone 5a stands for an average coldest night of -20 to -15 °F (-28.9 to -26.1 °C), so perennials hardy to zone 5a or a colder zone should come through a typical winter here.

Check the official USDA map for Sioux Falls: USDA Plant Hardiness Zone Map.

When the soil warms up in Sioux Falls

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 7 days before the last spring frost and 15 °C 17 days after it.

Frost dates near Sioux Falls

Of the nearest cities on our list, the last spring frost ends earliest in Omaha (16 April) and latest in Minneapolis (28 April).

Seeds, seedlings and markets in Sioux Falls

Within 15 km of Sioux Falls OpenStreetMap lists 1 garden centre, 5 farm-supply shops, 2 markets and 1 farm shop (collected 20 October 2026). The nearest market to the city centre is The Prairie Farmers' Market, 1 km away.

• The Prairie Farmers' Market — market
  North Cherapa Place 300, 57104 Sioux Falls · 1 km · theprairiefarmersmarket.com
• Prairie Greens Produce — farm shop
  East Birch Street 1200, 57005 Brandon · Sat 09:00–13:30 · 14 km · prairiegreensproduce.com
• Look's Marketplace — market
  East 69th Street 500, 57108 Sioux Falls · 6 km · looksmarket.com

• Where to buy seeds and seedlings in Sioux Falls
• Selling your own harvest in the United States

Places: © OpenStreetMap contributors, ODbL.

Weather in Sioux Falls by month

Average weather in Sioux Falls over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: May–September (21.5–29.2 °C). Nights average below 0 °C in November–March (-11–-1.4 °C). About 779 mm of rain falls in a year, on 94 days; June is the wettest month (110 mm) and February the driest (21 mm).

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).