What to do in St. Joseph now
St. Joseph is in cool-season grass country. Dates are typical for this spot, worked out from 23 years of weather at St Joseph Rosecrans Memorial Ap; each status uses this year's soil estimates.
Cool-season: tall fescue, Kentucky bluegrass, perennial ryegrass, fine fescue
- Crabgrass pre-emergent Closed Mar 31 Typical: Mar 30 – Apr 132-inch soil held 55°F for a week from Mar 31, so crabgrass was sprouting. Next window: about Mar 30 – Apr 13, 2027.
- Seed or overseed Seed now · last days Typical: Sep 17 – Oct 25The window usually closes by Oct 25, but this fall has kept 4-inch soil at 64°. Seed only if you can keep it moist, and expect slower germination as soil cools.
- Late-fall feeding Final feeding due now Typical: Nov 3 – Dec 1Not 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 Nov 3) and before it reaches 40°F (typically Dec 1).
Warm-season: bermudagrass, zoysia, St. Augustine, centipede, bahia
- Crabgrass pre-emergent Closed Mar 31 Typical: Mar 30 – Apr 132-inch soil held 55°F for a week from Mar 31, so crabgrass was sprouting. Next window: about Mar 30 – Apr 13, 2027.
- Seed or sod Wait for late spring Typical: May 13 – Sep 17Warm-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 13.
- Fall pre-emergent (Poa annua) Germinating since Oct 4 Typical: By Sep 154-inch soil fell below 70°F on Oct 4, 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 Any day now Typical: Around Oct 25Warm-season grass slows and browns once 4-inch soil stays under 55°F, typically Oct 25. Make the last nitrogen feeding at least a month before that.
The last 60 days and the week ahead
St. Joseph soil is 14° warmer than normal for Nov 3, warmer than on 97% of those dates since 2005, and 17° warmer than a year ago.
The green line is our estimate of the daily average soil temperature 2 inches down, driven by temperatures at St Joseph Rosecrans Memorial Ap, 7.6 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 | 58° | 60° | 79° / 52° | 55° |
| Oct 22 | 59° | 61° | 80° / 45° | 54° |
| Oct 23 | 61° | 62° | 81° / 48° | 54° |
| Oct 24 | 63° | 63° | 81° / 53° | 54° |
| Oct 25 | 64° | 64° | 83° / 49° | 53° |
| Oct 26 | 64° | 65° | 80° / 49° | 52° |
| Oct 27 | 64° | 65° | 73° / 54° | 51° |
| Oct 28 | 65° | 66° | 82° / 53° | 51° |
| Oct 29 | 65° | 65° | 74° / 54° | 50° |
| Oct 30 | 64° | 65° | 73° / 55° | 49° |
| Oct 31 | 64° | 65° | 65° / 60° | 49° |
| Nov 1 | 63° | 65° | 66° / 58° | 49° |
| Nov 2 | 64° | 65° | 70° / 63° | 49° |
| Nov 3 | 63° | 64° | 69° / 50° | 49° |
| Nov 4 (forecast) | 58° | 61° | 56° / 42° | 49° |
| Nov 5 (forecast) | 56° | 59° | 55° / 43° | 49° |
| Nov 6 (forecast) | 52° | 56° | 54° / 35° | 49° |
| Nov 7 (forecast) | 50° | 54° | 56° / 37° | 49° |
| Nov 8 (forecast) | 50° | 53° | 62° / 40° | 48° |
| Nov 9 (forecast) | 52° | 54° | 67° / 44° | 48° |
| Nov 10 (forecast) | 53° | 55° | 68° / 47° | 47° |
Which grass grows in St. Joseph
St. Joseph winters are cold enough (January averages 27°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.
St. Joseph 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 | 33° | 35° | 27° |
| Feb | 35° | 36° | 32° |
| Mar | 44° | 45° | 43° |
| Apr | 54° | 55° | 54° |
| May | 65° | 66° | 65° |
| Jun | 76° | 78° | 74° |
| Jul | 79° | 81° | 78° |
| Aug | 77° | 79° | 75° |
| Sep | 70° | 72° | 67° |
| Oct | 57° | 59° | 55° |
| Nov | 44° | 46° | 42° |
| Dec | 35° | 37° | 31° |
Soil: average of our daily estimates, 2005–2025. Air: NOAA 1991–2020 normals for the station.
Typical lawn dates in St. Joseph
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 18 | Apr 5 |
| Crabgrass model: 250 growing degree days | Mar 8 | Feb 18 |
| Pre-emergent window opens (2-inch soil 50°F) | Mar 30 | Mar 12 |
| Crabgrass begins to sprout (2-inch soil 55°F) | Apr 13 | Mar 31 |
| Cool-season lawns start growing (4-inch soil 55°F) | Apr 12 | Mar 30 |
| Warm-season seeding opens (4-inch soil 65°F) | May 13 | Apr 17 |
| Cool-season seeding opens (4-inch soil under 70°F) | Sep 17 | Oct 4 |
| Cool-season seeding ends (4-inch soil under 55°F) | Oct 25 | not yet |
| Warm-season grass goes dormant (4-inch under 55°F) | Oct 25 | not yet |
| First fall freeze (32°F) | Oct 16 | Oct 17 |
| Roots stop feeding (4-inch soil under 40°F) | Dec 1 | 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 KSTJ (ST JOSEPH ROSECRANS MEMORIAL AP), daily data since 1908. Forecast: National Weather Service, EAX office, issued Nov 4, 2026, 2:21 AM EST. Last observed day: Nov 3, 2026.
St. Joseph questions
What is the soil temperature in St. Joseph today? Our estimate for Nov 3 is 63°F at 2 inches and 64°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 St. Joseph? Apply when 2-inch soil holds about 50°F and before it holds 55°F. That has typically been Mar 30 to Apr 13 in St. Joseph. For 2026 the window closed on Mar 31.
Is it too late to overseed in St. Joseph? Seed now · last days. The window usually closes by Oct 25, but this fall has kept 4-inch soil at 64°. Seed only if you can keep it moist, and expect slower germination as soil cools.
Is it too late to fertilize in St. Joseph? 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 Nov 3) and before it reaches 40°F (typically Dec 1).
When is the last frost in St. Joseph? The last 32°F night of spring has typically come around Apr 18, and as late as May 3 in 1 year in 10. The first fall freeze typically arrives around Oct 16.
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.