LawnWeather

Sioux Falls, SD Lawn Care Calendar

In a typical year, put down crabgrass preventer in Sioux Falls between Apr 19 and May 15. The best time to overseed is between Jul 28 and Sep 16. The last spring frost usually comes around Apr 28. Most lawns here are cool-season grass (tall fescue, Kentucky bluegrass, ryegrass).

Typical lawn care dates in Sioux Falls

Crabgrass preventer (pre-emergent)
Apr 19 – May 15
Spring fertilizer
May 8 – Jun 12
Overseeding & seeding
Jul 28 – Sep 16
Fall fertilizer
Aug 24 – Oct 28
Light band: typical frost-free season. Bars: typical windows.
TaskTypical window
Crabgrass preventer (pre-emergent)Crabgrass sprouts once soil stays above 55°F. Apply when soil reaches 50°F, before that happens.Apr 19 – May 15
Spring fertilizerA light feeding once soil warms past 55°F and the grass is actively growing.May 8 – Jun 12
Overseeding & seedingLate summer to early fall: seedlings need about 6–10 weeks of growth before the first frost.Jul 28 – Sep 16
Fall fertilizerThe most important feeding for cool-season grass, from early fall until soil cools to about 45°F.Aug 24 – Oct 28

Median dates, 2016–2025, from NOAA weather data for Sioux Falls. This year's dates can differ by a few weeks.

Month-by-month lawn care in Sioux Falls

  1. JanuaryNo treatments due; mow as needed.
  2. FebruaryNo treatments due; mow as needed.
  3. MarchNo treatments due; mow as needed.
  4. AprilCrabgrass preventer (pre-emergent)
  5. MayCrabgrass preventer (pre-emergent)Spring fertilizer
  6. JuneSpring fertilizer
  7. JulyOverseeding & seeding
  8. AugustOverseeding & seedingFall fertilizer
  9. SeptemberOverseeding & seedingFall fertilizer
  10. OctoberFall fertilizer
  11. NovemberNo treatments due; mow as needed.
  12. DecemberNo treatments due; mow as needed.

Soil temperature in Sioux Falls by month

Average soil temperature 4 inches down, estimated from 2016–2025 weather. It bottoms out in January at 18°F and peaks in July at 74°F. Crabgrass preventer goes down when it reaches 50°F, usually around Apr 19.

JanFebMarAprMayJunJulAugSepOctNovDec
18°F20°F34°F44°F58°F71°F74°F72°F66°F51°F37°F24°F

Sioux Falls lawn timing, year by year

Over the last 10 years, soil in Sioux Falls reached 50°F, the signal for crabgrass preventer, as early as Apr 5 (2021) and as late as May 7 (2022): 32 days apart. A fixed calendar date can't follow that, which is why the report above uses this year's soil temperature. Between the typical last spring frost (Apr 28) and first fall frost (Oct 11), the growing season lasts about 166 days.

YearCrabgrass window openedLast spring frostFirst fall frost
2025Apr 23Apr 21Oct 22
2024Apr 14Apr 21Oct 14
2023Apr 12May 3Oct 10
2022May 7Apr 27Oct 7
2021Apr 5May 11Oct 23
2020Apr 23Apr 21Oct 2
2019Apr 21May 10Oct 11
2018Apr 30Apr 25Oct 4
2017Apr 15Apr 29Oct 10
2016Apr 15May 14Oct 13

Estimated from daily temperatures for Sioux Falls. A dash means it didn't happen that year.

Frequently asked questions

When should I apply pre-emergent in Sioux Falls?

In a typical year, between Apr 19 and May 15. Put it down when soil reaches 50°F, before it stays above 55°F and crabgrass starts sprouting. Early springs move this up by a week or more, so check this year's soil temperature above.

When is the best time to plant grass seed in Sioux Falls?

Early fall, typically Jul 28 – Sep 16, while soil cools from 65°F toward 50°F.

When is the last frost in Sioux Falls?

The median last spring frost is Apr 28 and the median first fall frost is Oct 11 (2016–2025).

How long is the growing season in Sioux Falls?

About 166 days, from the median last spring frost on Apr 28 to the median first fall frost on Oct 11 (2016–2025).

Lawn care guides

Growing vegetables too? See the Sioux Falls planting calendarfor when to start seeds and plant outside.

More South Dakota lawn calendars

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