What to do in Aurora now
Aurora is in cool-season grass country. Dates are typical for this spot, worked out from 23 years of weather at Chicago West Chicago Dupage Ap; each status uses this year's soil estimates.
Cool-season: tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue
- Crabgrass pre-emergent Closed Apr 16 Typical: Apr 13 – Apr 232-inch soil held 55°F for a week from Apr 16, so crabgrass was sprouting. Next window: about Apr 13 – Apr 23, 2027.
- Seed or overseed Last days · under 50°F by Nov 8 Typical: Sep 11 – Oct 20The window usually closes by Oct 20, but this fall has kept 4-inch soil at 59°. Seed only if you can keep it moist, and expect slower germination as soil cools.
- Late-fall feeding Final feeding due now Typical: Oct 31 – Nov 24Not 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 24).
Warm-season: bermudagrass, zoysia, St. Augustine, centipede, bahia
- Crabgrass pre-emergent Closed Apr 16 Typical: Apr 13 – Apr 232-inch soil held 55°F for a week from Apr 16, so crabgrass was sprouting. Next window: about Apr 13 – Apr 23, 2027.
- Seed or sod Wait for late spring Typical: May 27 – Sep 11Warm-season seed needs 4-inch soil at 65°F or more, and seedlings need the rest of summer to establish. Next window opens about May 27.
- Fall pre-emergent (Poa annua) Germinating since Sep 22 Typical: By Sep 104-inch soil fell below 70°F on Sep 22, when annual bluegrass begins to sprout. A pre-emergent now only stops later flushes; plan to apply by about Sep 10 next year.
- Dormancy and last feeding Any day now Typical: Around Oct 20Warm-season grass slows and browns once 4-inch soil stays under 55°F, typically Oct 20. Make the last nitrogen feeding at least a month before that.
The last 60 days and the week ahead
Aurora soil is 12° warmer than normal for Nov 3, warmer than on 99% of those dates since 2005, and 11° warmer than a year ago.
The green line is our estimate of the daily average soil temperature 2 inches down, driven by temperatures at Chicago West Chicago Dupage Ap, 15.1 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 21 | 54° | 56° | 71° / 39° | 51° |
| Oct 22 | 55° | 57° | 73° / 44° | 51° |
| Oct 23 | 56° | 57° | 70° / 43° | 51° |
| Oct 24 | 56° | 57° | 69° / 44° | 51° |
| Oct 25 | 57° | 58° | 73° / 47° | 50° |
| Oct 26 | 56° | 58° | 63° / 46° | 49° |
| Oct 27 | 57° | 58° | 68° / 48° | 49° |
| Oct 28 | 58° | 59° | 75° / 48° | 48° |
| Oct 29 | 57° | 58° | 68° / 42° | 48° |
| Oct 30 | 54° | 56° | 58° / 38° | 47° |
| Oct 31 | 55° | 56° | 61° / 50° | 46° |
| Nov 1 | 55° | 56° | – / – | 46° |
| Nov 2 | 56° | 57° | 61° / 54° | 46° |
| Nov 3 | 58° | 59° | 68° / 61° | 46° |
| Nov 4 (forecast) | 57° | 58° | 63° / 47° | 46° |
| Nov 5 (forecast) | 54° | 56° | 56° / 41° | 46° |
| Nov 6 (forecast) | 50° | 53° | 50° / 33° | 46° |
| Nov 7 (forecast) | 48° | 51° | 51° / 33° | 46° |
| Nov 8 (forecast) | 47° | 50° | 55° / 35° | 46° |
| Nov 9 (forecast) | 48° | 50° | 60° / 39° | 45° |
| Nov 10 (forecast) | 48° | 50° | 62° / 38° | 44° |
Which grass grows in Aurora
Aurora winters are cold enough (January averages 23°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.
Aurora 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 | 32° | 34° | 23° |
| Feb | 33° | 34° | 27° |
| Mar | 39° | 40° | 38° |
| Apr | 49° | 50° | 49° |
| May | 60° | 61° | 60° |
| Jun | 71° | 73° | 70° |
| Jul | 75° | 77° | 74° |
| Aug | 74° | 76° | 72° |
| Sep | 68° | 69° | 65° |
| Oct | 54° | 56° | 52° |
| Nov | 41° | 43° | 39° |
| Dec | 34° | 35° | 28° |
Soil: average of our daily estimates, 2005–2025. Air: NOAA 1991–2020 normals for the station.
Typical lawn dates in Aurora
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) | Apr 28 | May 7 |
| Crabgrass model: 250 growing degree days | Mar 26 | Mar 9 |
| Pre-emergent window opens (2-inch soil 50°F) | Apr 13 | Apr 13 |
| Crabgrass begins to sprout (2-inch soil 55°F) | Apr 23 | Apr 16 |
| Cool-season lawns start growing (4-inch soil 55°F) | Apr 23 | Apr 16 |
| Warm-season seeding opens (4-inch soil 65°F) | May 27 | May 27 |
| Cool-season seeding opens (4-inch soil under 70°F) | Sep 11 | Sep 22 |
| Cool-season seeding ends (4-inch soil under 55°F) | Oct 20 | Nov 8 |
| Warm-season grass goes dormant (4-inch under 55°F) | Oct 20 | Nov 8 |
| First fall freeze (32°F) | Oct 21 | not yet |
| Roots stop feeding (4-inch soil under 40°F) | Nov 24 | 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 KDPA (CHICAGO WEST CHICAGO DUPAGE AP), daily data since 1997. Forecast: National Weather Service, LOT office, issued Nov 4, 2026, 5:46 AM EST. Last observed day: Nov 3, 2026.
Aurora questions
What is the soil temperature in Aurora today? Our estimate for Nov 3 is 58°F at 2 inches and 59°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 Aurora? Apply when 2-inch soil holds about 50°F and before it holds 55°F. That has typically been Apr 13 to Apr 23 in Aurora. For 2026 the window closed on Apr 16.
Is it too late to overseed in Aurora? Last days · under 50°F by Nov 8. The window usually closes by Oct 20, but this fall has kept 4-inch soil at 59°. Seed only if you can keep it moist, and expect slower germination as soil cools.
Is it too late to fertilize in Aurora? 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 24).
When is the last frost in Aurora? The last 32°F night of spring has typically come around Apr 28, and as late as May 10 in 1 year in 10. The first fall freeze typically arrives around Oct 21.
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.