When to Plant Grass Seed in Minnesota

Cool-season lawns dominate Minnesota, and for cool-season seed fall is the better window, with spring the second choice. The dates below are typical crossings from in-state monitoring stations; your city page tracks the live reading.

Best Time to Plant Grass Seed in Minnesota

Cool-season · fall window

July 28

July 27 (coolest parts) to July 31 (warmest)

For cool-season lawns (fescue, bluegrass, ryegrass), fall is the best time to plant grass seed in Minnesota, with spring the second choice: fall seedlings face less weed competition and mature before summer heat. The window opens as 2-inch soil falls back through 70°F, and germination slows sharply once soil drops below 50°F, typically around October 16. Fall seeding and fall pre-emergent are an either/or on the same turf; see pre-emergent timing in Minnesota.

Cool-season · spring window

May 11

May 9 (warmest parts) to May 27 (coolest)

Spring is the second choice: the window opens when soil first holds 50°F and narrows as soil passes 65°F, typically by June 21.

Region	Typical spring window opens	Typical fall window opens	Stations
Northern Minnesota	May 27	—	2
Central Minnesota	May 11	July 31	2

Fall seeding also needs a stop date: new seedlings want about six weeks of growth before frost arrives. Your city page estimates the last safe seeding date from its nearest station: see when to plant in Minneapolis, when to plant in Saint Paul or when to plant in Young America. Today's statewide reading is on the Minnesota soil temperature page.

Typical dates are computed from historical 2-inch soil temperature averages at 4 monitoring stations in Minnesota; your own window depends on your nearest station's readings.

Best Time to Plant Grass Seed in Minnesota: Month by Month

Typical 2-inch soil temperature by month across Minnesota, the median of 4 in-state stations with multi-year records, with the seeding verdict for each grass family. Confirm against the current reading on your city page before you put seed down.

Month	Typical 2" soil temp	Cool-season seeding	Warm-season seeding
January	31°F	Dormant	Too cold
February	30°F	Dormant	Too cold
March	32°F	Dormant	Too cold
April	38°F	Dormant	Too cold
May	52°F	Good; fall is better	Too cold
June	64°F	Good; fall is better	Approaching
July	68°F	Risky; heat ahead	Prime window
August	67°F	Soon; still cooling	Too late this year
September	61°F	Prime window	Too cold
October	52°F	Prime window	Too cold
November	39°F	Dormant	Too cold
December	32°F	Dormant	Too cold