Frost dates for 77318Willis, TX
The average last spring frost in Willis is February 24 and the average first fall frost is December 2, giving a typical growing season of about 285 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Feb 24
- Average first fall frost
- Dec 2
- Growing season
- 285 days
Safer after Mar 17 (1-in-10 risk)
Possible by Nov 11 (1-in-10 risk)
First frost typically in 37 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Feb 16 · Mar 9 · Mar 31 | Nov 2 · Nov 20 · Dec 8 | 254 days | 100% |
| Frost / freeze (32°F) | Jan 26 · Feb 24 · Mar 17 | Nov 11 · Dec 2 · Jan 2 | 285 days | 100% |
| Hard freeze (28°F) | Dec 31 · Feb 2 · Mar 6 | Nov 24 · Dec 23 · Jan 28 | 321 days | 93% |
Planting calendar for Willis
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Jan 24 – Apr 1 |
| Tomatoes | Transplant outdoors | Mar 12 – Aug 12 |
| Peppers | Start seeds indoors | Jan 24 – Feb 24 |
| Peppers | Transplant outdoors | Mar 26 – Apr 26 |
| Eggplant | Start seeds indoors | Feb 10 – Mar 11 |
| Eggplant | Transplant outdoors | Mar 26 – Apr 26 |
| Cucumbers | Sow outdoors | Mar 26 – Aug 22 |
| Summer squash | Sow outdoors | Mar 12 – Apr 26 |
| Winter squash & pumpkins | Sow outdoors | Mar 26 – Apr 26 |
| Snap beans | Sow outdoors | Mar 12 – Sep 14 |
| Sweet corn | Sow outdoors | Mar 12 – Aug 12 |
| Watermelon & cantaloupe | Sow outdoors | Mar 26 – Apr 26 |
| Okra | Sow outdoors | Mar 19 – Apr 11 |
| Peas | Sow outdoors (spring) | Jan 24 – Mar 11 |
| Potatoes | Plant outdoors (spring) | Jan 24 – Mar 26 |
| Onions | Start seeds indoors (spring) | Dec 13 – Jan 9 |
| Onions | Transplant outdoors (spring) | Feb 10 – Mar 11 |
| Broccoli | Start seeds indoors (spring) | Jan 6 – Feb 9 |
| Broccoli | Transplant outdoors (spring) | Feb 10 – Mar 11 |
| Broccoli | Start seeds indoors (fall) | Aug 2 – Aug 12 |
| Broccoli | Transplant outdoors (fall) | Sep 1 – Sep 12 |
| Cabbage | Start seeds indoors (spring) | Dec 27 – Jan 24 |
| Cabbage | Transplant outdoors (spring) | Jan 24 – Feb 24 |
| Cabbage | Start seeds indoors (fall) | Jul 23 – Aug 22 |
| Cabbage | Transplant outdoors (fall) | Aug 22 – Sep 22 |
| Leaf lettuce | Sow outdoors (spring) | Jan 24 – Apr 11 |
| Leaf lettuce | Sow outdoors (fall) | Aug 22 – Oct 8 |
| Spinach | Sow outdoors (spring) | Jan 17 – Mar 2 |
| Spinach | Sow outdoors (fall) | Sep 8 – Oct 13 |
| Radishes | Sow outdoors (spring) | Jan 24 – Mar 16 |
| Radishes | Sow outdoors (fall) | Aug 22 – Oct 23 |
| Kale | Sow outdoors (spring) | Feb 10 – Mar 2 |
| Kale | Sow outdoors (fall) | Aug 15 – Sep 22 |
| Carrots | Sow outdoors (spring) | Feb 24 – Apr 11 |
| Carrots | Sow outdoors (fall) | Jul 23 – Sep 7 |
| Garlic | Plant outdoors (fall) | Nov 22 – Dec 23 |
Where these dates come from
ZIP code 77318 is matched to the NOAA station Conroe, TX, 13.5 km away, at 245 ft elevation (21 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Conroe, TX (used) | 245 ft | Feb 24 | Dec 2 |
| Conroe Montgomery Co Ap, TX | 245 ft | Mar 11 | Nov 19 |
| Huntsville, TX | 494 ft | Mar 1 | Nov 28 |
| Huntsville Muni Ap, TX | 366 ft | Mar 2 | Nov 26 |
Frost dates near Willis
- Willis, TX 77378 · last Mar 11, first Nov 19
- New Waverly, TX 77358 · last Mar 11, first Nov 19
- Conroe, TX 77304 · last Feb 24, first Dec 2
- Spring, TX 77393 · last Feb 24, first Dec 2
- Montgomery, TX 77356 · last Feb 24, first Dec 2
- Huntsville, TX 77340 · last Mar 2, first Nov 26
- Magnolia, TX 77354 · last Feb 24, first Dec 2
- Dobbin, TX 77333 · last Feb 24, first Dec 2
Frequently asked questions
- When is the last frost in Willis, TX?
- For ZIP code 77318, the average last spring frost (32°F) is February 24, based on NOAA 1991-2020 climate normals for the Conroe, TX weather station. There is a 1-in-10 chance of a frost after March 17.
- When is the first frost in Willis, TX?
- The average first fall frost (32°F) is December 2. There is a 1-in-10 chance of frost by November 11, so tender plants are at risk from that point on.
- How long is the growing season in 77318?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 285 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.