Frost dates for 78115Geronimo, TX
The average last spring frost in Geronimo is March 1 and the average first fall frost is November 26, giving a typical growing season of about 273 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 1
- Average first fall frost
- Nov 26
- Growing season
- 273 days
Safer after Mar 20 (1-in-10 risk)
Possible by Nov 8 (1-in-10 risk)
First frost typically in 27 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 23 · Mar 13 · Apr 3 | Oct 31 · Nov 15 · Dec 2 | 246 days | 100% |
| Frost / freeze (32°F) | Feb 3 · Mar 1 · Mar 20 | Nov 8 · Nov 26 · Dec 20 | 273 days | 100% |
| Hard freeze (28°F) | Jan 11 · Feb 13 · Mar 10 | Nov 18 · Dec 11 · Jan 16 | 306 days | 97% |
Planting calendar for Geronimo
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 29 – Apr 6 |
| Tomatoes | Transplant outdoors | Mar 17 – Aug 6 |
| Peppers | Start seeds indoors | Jan 29 – Mar 1 |
| Peppers | Transplant outdoors | Mar 31 – May 1 |
| Eggplant | Start seeds indoors | Feb 15 – Mar 16 |
| Eggplant | Transplant outdoors | Mar 31 – May 1 |
| Cucumbers | Sow outdoors | Mar 31 – Aug 16 |
| Summer squash | Sow outdoors | Mar 17 – May 1 |
| Winter squash & pumpkins | Sow outdoors | Mar 31 – May 1 |
| Snap beans | Sow outdoors | Mar 17 – Sep 8 |
| Sweet corn | Sow outdoors | Mar 17 – Aug 6 |
| Watermelon & cantaloupe | Sow outdoors | Mar 31 – May 1 |
| Okra | Sow outdoors | Mar 24 – Apr 16 |
| Peas | Sow outdoors (spring) | Jan 29 – Mar 16 |
| Potatoes | Plant outdoors (spring) | Jan 29 – Mar 31 |
| Onions | Start seeds indoors (spring) | Dec 18 – Jan 14 |
| Onions | Transplant outdoors (spring) | Feb 15 – Mar 16 |
| Broccoli | Start seeds indoors (spring) | Jan 11 – Feb 14 |
| Broccoli | Transplant outdoors (spring) | Feb 15 – Mar 16 |
| Broccoli | Start seeds indoors (fall) | Jul 27 – Aug 6 |
| Broccoli | Transplant outdoors (fall) | Aug 26 – Sep 6 |
| Cabbage | Start seeds indoors (spring) | Jan 1 – Jan 29 |
| Cabbage | Transplant outdoors (spring) | Jan 29 – Mar 1 |
| Cabbage | Start seeds indoors (fall) | Jul 17 – Aug 16 |
| Cabbage | Transplant outdoors (fall) | Aug 16 – Sep 16 |
| Leaf lettuce | Sow outdoors (spring) | Jan 29 – Apr 16 |
| Leaf lettuce | Sow outdoors (fall) | Aug 16 – Oct 2 |
| Spinach | Sow outdoors (spring) | Jan 22 – Mar 7 |
| Spinach | Sow outdoors (fall) | Sep 2 – Oct 7 |
| Radishes | Sow outdoors (spring) | Jan 29 – Mar 21 |
| Radishes | Sow outdoors (fall) | Aug 16 – Oct 17 |
| Kale | Sow outdoors (spring) | Feb 15 – Mar 7 |
| Kale | Sow outdoors (fall) | Aug 9 – Sep 16 |
| Carrots | Sow outdoors (spring) | Mar 1 – Apr 16 |
| Carrots | Sow outdoors (fall) | Jul 17 – Sep 1 |
| Garlic | Plant outdoors (fall) | Nov 16 – Dec 17 |
Where these dates come from
ZIP code 78115 is matched to the NOAA station Austin San Antonio, TX, 17.7 km away, at 633 ft elevation (95 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Austin San Antonio, TX (used) | 633 ft | Mar 1 | Nov 26 |
| New Braunfels, TX | 720 ft | Mar 8 | Nov 18 |
| New Braunfels Wfo, TX | 628 ft | Feb 25 | Nov 25 |
| Randolph Afb, TX | 760 ft | Feb 21 | Dec 5 |
Frost dates near Geronimo
- Mc Queeney, TX 78123 · last Mar 1, first Nov 26
- Seguin, TX 78155 · last Mar 1, first Nov 26
- Marion, TX 78124 · last Mar 8, first Nov 18
- Cibolo, TX 78108 · last Mar 8, first Nov 18
- Saint Hedwig, TX 78152 · last Feb 20, first Dec 3
- New Braunfels, TX 78131 · last Mar 1, first Nov 26
- Jbsa Randolph, TX 78150 · last Mar 7, first Nov 22
- La Vernia, TX 78121 · last Mar 6, first Nov 20
Frequently asked questions
- When is the last frost in Geronimo, TX?
- For ZIP code 78115, the average last spring frost (32°F) is March 1, based on NOAA 1991-2020 climate normals for the Austin San Antonio, TX weather station. There is a 1-in-10 chance of a frost after March 20.
- When is the first frost in Geronimo, TX?
- The average first fall frost (32°F) is November 26. There is a 1-in-10 chance of frost by November 8, so tender plants are at risk from that point on.
- How long is the growing season in 78115?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 273 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.