What to do in Rocklin now
Rocklin is in warm-season grass country. Dates are typical for this spot, worked out from 23 years of weather at Sacramento Metropolitan Ap; each status uses this year's soil estimates.
Cool-season: tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue
- Crabgrass pre-emergent Closed Mar 1 Typical: Feb 9 – Mar 162-inch soil held 55°F for a week from Mar 1, so crabgrass was sprouting. Next window: about Feb 9 – Mar 16, 2027.
- Seed or overseed Seed now · about 18 days left Typical: Oct 10 – Nov 214-inch soil is 57°, inside the 55–70°F range where tall fescue and bluegrass sprout fastest. The window typically closes around Nov 21.
- Late-fall feeding Soil rarely cools to 40°F Typical: Through winterRoots stay active through most winters here. Feed on the fall schedule your extension office gives for your grass, and avoid feeding a lawn that is dormant from drought.
Warm-season: bermudagrass, zoysia, St. Augustine, centipede, bahia
- Crabgrass pre-emergent Closed Mar 1 Typical: Feb 9 – Mar 162-inch soil held 55°F for a week from Mar 1, so crabgrass was sprouting. Next window: about Feb 9 – Mar 16, 2027.
- Seed or sod Wait for late spring Typical: Apr 27 – Oct 10Warm-season seed needs 4-inch soil at 65°F or more, and seedlings need the rest of summer to establish. Next window opens about Apr 27.
- Fall pre-emergent (Poa annua) Germinating since Oct 15 Typical: By Oct 94-inch soil fell below 70°F on Oct 15, when annual bluegrass begins to sprout. A pre-emergent now only stops later flushes; plan to apply by about Oct 9 next year.
- Dormancy and last feeding Expected about Nov 21 Typical: Around Nov 21Warm-season grass slows and browns once 4-inch soil stays under 55°F, typically Nov 21. Make the last nitrogen feeding at least a month before that.
The last 60 days and the week ahead
Rocklin soil is 5° cooler than normal for Nov 3, cooler than on 98% of those dates since 2005, and 8° cooler than a year ago.
The green line is our estimate of the daily average soil temperature 2 inches down, driven by temperatures at Sacramento Metropolitan Ap, 32.2 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 | 64° | 66° | 72° / 48° | 65° |
| Oct 21 | 63° | 65° | 66° / 54° | 64° |
| Oct 22 | 61° | 64° | 62° / 53° | 64° |
| Oct 23 | 62° | 64° | 71° / 54° | 64° |
| Oct 24 | 61° | 63° | 75° / 47° | 63° |
| Oct 25 | 61° | 63° | 75° / 46° | 63° |
| Oct 26 | 62° | 63° | 73° / 53° | 62° |
| Oct 27 | 60° | 62° | 66° / 46° | 62° |
| Oct 28 | 58° | 61° | 70° / 39° | 61° |
| Oct 29 | 57° | 60° | 68° / 42° | 61° |
| Oct 30 | 58° | 60° | 71° / 49° | 60° |
| Oct 31 | 58° | 60° | 66° / 48° | 60° |
| Nov 1 | 57° | 59° | 70° / 43° | 60° |
| Nov 2 | 56° | 58° | 66° / 43° | 59° |
| Nov 3 | 54° | 57° | 57° / 42° | 59° |
| Nov 4 (forecast) | 55° | 57° | 69° / 45° | 59° |
| Nov 5 (forecast) | 56° | 57° | 71° / 45° | 58° |
| Nov 6 (forecast) | 57° | 58° | 71° / 47° | 58° |
| Nov 7 (forecast) | 58° | 59° | 74° / 47° | 57° |
| Nov 8 (forecast) | 59° | 60° | 74° / 50° | 57° |
| Nov 9 (forecast) | 59° | 60° | 73° / 49° | 56° |
Which grass grows in Rocklin
With mild winters (January averages 47°F), most Rocklin lawns are warm-season grasses such as bermudagrass, St. Augustine, zoysia and centipede. They grow through summer and slow or go dormant in winter.
Rocklin 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 | 46° | 47° | 47° |
| Feb | 50° | 51° | 50° |
| Mar | 54° | 55° | 54° |
| Apr | 60° | 61° | 59° |
| May | 68° | 69° | 66° |
| Jun | 75° | 76° | 72° |
| Jul | 79° | 81° | 76° |
| Aug | 78° | 80° | 75° |
| Sep | 74° | 76° | 72° |
| Oct | 65° | 67° | 64° |
| Nov | 54° | 56° | 53° |
| Dec | 46° | 48° | 46° |
Soil: average of our daily estimates, 2005–2025. Air: NOAA 1991–2020 normals for the station.
Typical lawn dates in Rocklin
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) | Feb 26 | Jan 25 |
| Crabgrass model: 250 growing degree days | Jan 17 | Jan 15 |
| Pre-emergent window opens (2-inch soil 50°F) | Feb 9 | Feb 7 |
| Crabgrass begins to sprout (2-inch soil 55°F) | Mar 16 | Mar 1 |
| Cool-season lawns start growing (4-inch soil 55°F) | Mar 15 | Mar 1 |
| Warm-season seeding opens (4-inch soil 65°F) | Apr 27 | Mar 21 |
| Cool-season seeding opens (4-inch soil under 70°F) | Oct 10 | Oct 16 |
| Cool-season seeding ends (4-inch soil under 55°F) | Nov 21 | not yet |
| Warm-season grass goes dormant (4-inch under 55°F) | Nov 21 | not yet |
| First fall freeze (32°F) | Nov 26 | 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 KSMF (SACRAMENTO METROPOLITAN AP), daily data since 1998. Forecast: National Weather Service, STO office, issued Nov 4, 2026, 4:00 AM EST. Last observed day: Nov 3, 2026.
Rocklin questions
What is the soil temperature in Rocklin today? Our estimate for Nov 3 is 54°F at 2 inches and 57°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 Rocklin? Apply when 2-inch soil holds about 50°F and before it holds 55°F. That has typically been Feb 9 to Mar 16 in Rocklin. For 2026 the window closed on Mar 1.
When can I seed bermudagrass in Rocklin? Wait for late spring. Warm-season seed needs 4-inch soil at 65°F or more, and seedlings need the rest of summer to establish. Next window opens about Apr 27.
Is it too late to fertilize in Rocklin? Expected about Nov 21. Warm-season grass slows and browns once 4-inch soil stays under 55°F, typically Nov 21. Make the last nitrogen feeding at least a month before that.
When is the last frost in Rocklin? The last 32°F night of spring has typically come around Feb 26, and as late as Mar 20 in 1 year in 10. The first fall freeze typically arrives around Nov 26.
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.