Soilclock

South Dakota 54°F soil temperature

Updated Nov 4, 2026, 7:41 AM EST

The middle reading of 2 South Dakota cities, 2 inches down, on Nov 3. Pick a city for its forecast and lawn calendar.

South Dakota cities today

Estimated daily average soil temperature at 2 inches, the difference from normal for the date, and the change over the last week. South Dakota spans cool-season grass country.

City2 in4 invs normal7 daysCrabgrass windowFall seeding ends
Sioux Falls 54°55° +11°+4° Apr 13 – May 3 Oct 16
Rapid City 47°49° +4°+2° Apr 23 – May 15 Oct 13

When to apply pre-emergent in South Dakota

Crabgrass pre-emergent goes down when 2-inch soil holds about 50°F. Across South Dakota that has typically happened first in Sioux Falls, around Apr 13, and last in Rapid City, around Apr 23. The window closes when soil holds 55°F and crabgrass starts sprouting.

Close view of a Kentucky bluegrass lawn
Kentucky bluegrass, the most common cool-season lawn grass in the northern US.

Last good week to seed in South Dakota

Tall fescue and bluegrass seed sprouts best while 4-inch soil is between 55 and 70°F. The typical last day above 55°F:

What grows in South Dakota lawns

Crabgrass is the weed spring pre-emergents are timed for. Lawns here are mostly cool-season grasses such as bluegrass and fescue.

Large crabgrass with its spreading finger-like seed heads
Large crabgrass in seed. Each plant can drop thousands of seeds that wait for warm spring soil.
Close view of a Kentucky bluegrass lawn
Kentucky bluegrass, the most common cool-season lawn grass in the northern US.
A low mat of bermudagrass with fine blades and seed heads
Bermudagrass, the warm-season grass behind most lawns from the Carolinas to Texas.

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