Perennial Flower

When to Plant Daylilies in South Dakota

Nearly indestructible perennials with stunning trumpet-shaped blooms. Each flower lasts just one day, but the show goes on for weeks.

The Short Answer

In South Dakota, plant daylilies based on your regional frost dates. Western South Dakota has a last frost around May 10 - May 30, while Eastern South Dakota sees frost end around May 5 - May 20. Cold, windy climate. Short growing season. Warm summers with long days help compensate. Wind protection important.

South Dakota Frost Dates

Your planting dates depend on which part of South Dakota you're in. Here are the frost date ranges by region:

Region	Zones	Last Frost (Spring)	First Frost (Fall)
Western South Dakota	3b, 4a, 4b	May 10 - May 30	Sep 10 - Sep 25
Eastern South Dakota	4a, 4b, 5a	May 5 - May 20	Sep 20 - Oct 5

Daylilies Planting Schedule for South Dakota

Western South Dakota (Zones 3b, 4a, 4b)

Average last frost: May 10 - May 30 · Average first frost: Sep 10 - Sep 25

Transplant Outside

0 wks after frost

Eastern South Dakota (Zones 4a, 4b, 5a)

Average last frost: May 5 - May 20 · Average first frost: Sep 20 - Oct 5

Transplant Outside

0 wks after frost

Growing Daylilies in South Dakota

Daylilies in South Dakota's Climate

Daylilies are bombproof perennials for cold climates. They survive harsh winters, tolerate poor soil, and bloom reliably through moderate summers. Choose dormant varieties for the coldest zones — they go completely dormant in winter and emerge vigorously each spring. Stella de Oro reblooms from June through frost.

Soil Considerations for South Dakota

Prairie soils in east — excellent fertility. Thin, alkaline soils in Black Hills. Clay in some areas.

South Dakota Climate & Growing Season

Cold, windy climate. Short growing season. Warm summers with long days help compensate. Wind protection important. Daylilies can handle frost well, which is an advantage in South Dakota's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across South Dakota: Western South Dakota (3b, 4a, 4b) has a last frost around May 10 - May 30, while Eastern South Dakota (4a, 4b, 5a) sees frost end around May 5 - May 20. This difference matters for daylilies — adjust your planting dates to match your specific region.

Growing Tips

Plant bare-root or divisions in spring or fall. Divide clumps every 3-4 years to maintain vigor. Deadhead to keep gardens tidy.

Companion Planting

Plant daylilies alongside these companions for better growth:

Coneflowers Black Eyed Susans

The Bottom Line

Daylilies can be grown successfully across South Dakota, but your exact planting dates depend on which region you're in. Western South Dakota gardeners should plan around a May 10 - May 30 last frost, while those in Eastern South Dakota can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026