What to do in Denver now
Denver is in cool-season grass country. Dates are typical for this spot, worked out from 23 years of weather at Denver Intl Ap; each status uses this year's soil estimates.
Cool-season: tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue
- Crabgrass pre-emergent Closed Mar 24 Typical: Apr 11 – May 102-inch soil held 55°F for a week from Mar 24, so crabgrass was sprouting. Next window: about Apr 11 – May 10, 2027.
- Seed or overseed Late · risky Typical: Sep 16 – Oct 18Soil fell below 55°F on Oct 31. Seed sown now germinates slowly and may not survive winter. The hard stop, 4-inch soil under 50°F, typically comes around Oct 31.
- Late-fall feeding Final feeding due now Typical: Oct 31 – Nov 29Not too late. Feed on your normal fall schedule; the last feeding of the year goes down when 4-inch soil falls to about 50°F (typically Oct 31) and before it reaches 40°F (typically Nov 29).
Warm-season: bermudagrass, zoysia, St. Augustine, centipede, bahia
- Crabgrass pre-emergent Closed Mar 24 Typical: Apr 11 – May 102-inch soil held 55°F for a week from Mar 24, so crabgrass was sprouting. Next window: about Apr 11 – May 10, 2027.
- Seed or sod Wait for late spring Typical: Jun 4 – Sep 16Warm-season seed needs 4-inch soil at 65°F or more, and seedlings need the rest of summer to establish. Next window opens about Jun 4.
- Fall pre-emergent (Poa annua) Germinating since Sep 23 Typical: By Sep 154-inch soil fell below 70°F on Sep 23, when annual bluegrass begins to sprout. A pre-emergent now only stops later flushes; plan to apply by about Sep 15 next year.
- Dormancy and last feeding Dormant since about Oct 31 Typical: Around Oct 184-inch soil has stayed under 55°F since Oct 31, so warm-season grass is going brown. It is too late to fertilize; feed again after spring green-up, once soil holds 65°F (typically Jun 4).
The last 60 days and the week ahead
Denver soil is 3° warmer than normal for Nov 3, warmer than on 69% of those dates since 2005, and 4° warmer than a year ago.
The green line is our estimate of the daily average soil temperature 2 inches down, driven by temperatures at Denver Intl Ap, 21.4 km from the city center. The dashed part runs the National Weather Service forecast through the same model. Hover or tap for any day.
2-inch soil, estimated From the NWS forecast Normal Normal range (8 years in 10)
Show the numbers
| Date | 2-inch soil | 4-inch soil | Air high / low | Normal (2 in) |
|---|---|---|---|---|
| Oct 20 | 58° | 59° | 73° / 52° | 53° |
| Oct 21 | 59° | 60° | 75° / 49° | 52° |
| Oct 22 | 61° | 61° | 74° / 54° | 52° |
| Oct 23 | 63° | 63° | 77° / 58° | 52° |
| Oct 24 | 58° | 60° | 57° / 37° | 51° |
| Oct 25 | 55° | 57° | 58° / 37° | 50° |
| Oct 26 | 52° | 55° | 54° / 39° | 50° |
| Oct 27 | 52° | 54° | 64° / 37° | 49° |
| Oct 28 | 52° | 54° | 66° / 40° | 48° |
| Oct 29 | 52° | 54° | 66° / 37° | 47° |
| Oct 30 | 52° | 54° | 63° / 42° | 47° |
| Oct 31 | 52° | 53° | 58° / 43° | 47° |
| Nov 1 | 53° | 54° | 67° / 43° | 47° |
| Nov 2 | 51° | 53° | 52° / 42° | 47° |
| Nov 3 | 49° | 52° | 56° / 37° | 47° |
| Nov 4 (forecast) | 49° | 51° | 57° / 37° | 47° |
| Nov 5 (forecast) | 48° | 50° | 58° / 38° | 47° |
| Nov 6 (forecast) | 48° | 50° | 57° / 35° | 47° |
| Nov 7 (forecast) | 47° | 49° | 59° / 36° | 47° |
| Nov 8 (forecast) | 49° | 50° | 66° / 39° | 46° |
| Nov 9 (forecast) | 50° | 51° | 65° / 39° | 46° |
Which grass grows in Denver
Denver winters are cold enough (January averages 32°F) that cool-season grasses, mostly Kentucky bluegrass, tall fescue and perennial ryegrass, make up most lawns. They grow in spring and fall and slow down in summer heat.
Denver soil through the year
Weekly 2-inch estimates for 2026 so far against 2025 and the normal for each week. The red lines mark 50°F, when crabgrass pre-emergent should be down, and 65°F, when warm-season seed sprouts well.
2026 2025 Normal (2005–2025) 8 years in 10
Normal by month
| Month | 2 in | 4 in | Air |
|---|---|---|---|
| Jan | 35° | 36° | 32° |
| Feb | 36° | 37° | 33° |
| Mar | 42° | 43° | 42° |
| Apr | 48° | 49° | 48° |
| May | 57° | 58° | 57° |
| Jun | 70° | 71° | 68° |
| Jul | 77° | 79° | 75° |
| Aug | 75° | 77° | 73° |
| Sep | 68° | 70° | 65° |
| Oct | 54° | 56° | 51° |
| Nov | 43° | 44° | 40° |
| Dec | 36° | 37° | 31° |
Soil: average of our daily estimates, 2005–2025. Air: NOAA 1991–2020 normals for the station.
Typical lawn dates in Denver
Each date is when the soil estimate (or the air, for freezes) crossed the threshold, year by year since 2005. “Early” and “late” are the 10th and 90th percentile years, so 8 years in 10 fall between them.
| Event | Typical | 2026 |
|---|---|---|
| Last spring freeze (32°F) | May 9 | May 6 |
| Crabgrass model: 250 growing degree days | Mar 2 | Feb 7 |
| Pre-emergent window opens (2-inch soil 50°F) | Apr 11 | Mar 21 |
| Crabgrass begins to sprout (2-inch soil 55°F) | May 10 | Mar 24 |
| Cool-season lawns start growing (4-inch soil 55°F) | May 4 | Mar 24 |
| Warm-season seeding opens (4-inch soil 65°F) | Jun 4 | Jun 1 |
| Cool-season seeding opens (4-inch soil under 70°F) | Sep 16 | Sep 25 |
| Cool-season seeding ends (4-inch soil under 55°F) | Oct 18 | Oct 31 |
| Warm-season grass goes dormant (4-inch under 55°F) | Oct 18 | Oct 31 |
| First fall freeze (32°F) | Oct 9 | Oct 16 |
| Roots stop feeding (4-inch soil under 40°F) | Nov 29 | not yet |
Where these numbers come from
There is no soil sensor in most cities, so we estimate it. Shallow soil follows air temperature with a lag of a few days, and runs a little warmer than the air in fall. We fitted that relationship to 190 USDA soil-sensor stations; on years held out of the fit, the estimate was off by 3.3°F on an average day, and it put the spring 55°F date within a median of 3 days. Read the methodology.
Weather: RCC ACIS station KDEN (DENVER INTL AP), daily data since 1994. Forecast: National Weather Service, BOU office, issued Nov 4, 2026, 1:46 AM EST. Last observed day: Nov 3, 2026.
Denver questions
What is the soil temperature in Denver today? Our estimate for Nov 3 is 49°F at 2 inches and 52°F at 4 inches, as a daily average. Early-morning soil runs a few degrees cooler than that, and afternoon soil warmer.
When should I put down crabgrass pre-emergent in Denver? Apply when 2-inch soil holds about 50°F and before it holds 55°F. That has typically been Apr 11 to May 10 in Denver. For 2026 the window closed on Mar 24.
Is it too late to overseed in Denver? Late · risky. Soil fell below 55°F on Oct 31. Seed sown now germinates slowly and may not survive winter. The hard stop, 4-inch soil under 50°F, typically comes around Oct 31.
Is it too late to fertilize in Denver? Final feeding due now. Not too late. Feed on your normal fall schedule; the last feeding of the year goes down when 4-inch soil falls to about 50°F (typically Oct 31) and before it reaches 40°F (typically Nov 29).
When is the last frost in Denver? The last 32°F night of spring has typically come around May 9, and as late as May 21 in 1 year in 10. The first fall freeze typically arrives around Oct 9.
Why 2 inches and 4 inches? Crabgrass and most weed seeds sprout in the top inch or two, so pre-emergent timing follows 2-inch soil. Grass seed and roots respond to the slightly steadier soil at about 4 inches.
How accurate is this? It is a model, not a probe in your yard. Expect about 3–4°F of difference on a given day; shade, slope, mulch and irrigation all move real soil. The dates and trends are more reliable than any single day.