Frost dates for 77480Sweeny, TX
The average last spring frost in Sweeny is February 13 and the average first fall frost is December 8, giving a typical growing season of about 301 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Feb 13
- Average first fall frost
- Dec 8
- Growing season
- 301 days
Safer after Mar 17 (1-in-10 risk)
Possible by Nov 18 (1-in-10 risk)
First frost typically in 43 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) | Jan 31 · Mar 2 · Mar 31 | Nov 5 · Nov 25 · Dec 16 | 266 days | 100% |
| Frost / freeze (32°F) | Jan 10 · Feb 13 · Mar 17 | Nov 18 · Dec 8 · Jan 12 | 301 days | 98% |
| Hard freeze (28°F) | Dec 23 · Jan 26 · Mar 3 | Dec 3 · Jan 1 · Feb 5 | 340 days | 78% |
Planting calendar for Sweeny
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 13 – Mar 21 |
| Tomatoes | Transplant outdoors | Mar 1 – Aug 18 |
| Peppers | Start seeds indoors | Jan 13 – Feb 13 |
| Peppers | Transplant outdoors | Mar 15 – Apr 15 |
| Eggplant | Start seeds indoors | Jan 30 – Feb 28 |
| Eggplant | Transplant outdoors | Mar 15 – Apr 15 |
| Cucumbers | Sow outdoors | Mar 15 – Aug 28 |
| Summer squash | Sow outdoors | Mar 1 – Apr 15 |
| Winter squash & pumpkins | Sow outdoors | Mar 15 – Apr 15 |
| Snap beans | Sow outdoors | Mar 1 – Sep 20 |
| Sweet corn | Sow outdoors | Mar 1 – Aug 18 |
| Watermelon & cantaloupe | Sow outdoors | Mar 15 – Apr 15 |
| Okra | Sow outdoors | Mar 8 – Mar 31 |
| Peas | Sow outdoors (spring) | Jan 13 – Feb 28 |
| Potatoes | Plant outdoors (spring) | Jan 13 – Mar 15 |
| Onions | Start seeds indoors (spring) | Dec 2 – Dec 29 |
| Onions | Transplant outdoors (spring) | Jan 30 – Feb 28 |
| Broccoli | Start seeds indoors (spring) | Dec 26 – Jan 29 |
| Broccoli | Transplant outdoors (spring) | Jan 30 – Feb 28 |
| Broccoli | Start seeds indoors (fall) | Aug 8 – Aug 18 |
| Broccoli | Transplant outdoors (fall) | Sep 7 – Sep 18 |
| Cabbage | Start seeds indoors (spring) | Dec 16 – Jan 13 |
| Cabbage | Transplant outdoors (spring) | Jan 13 – Feb 13 |
| Cabbage | Start seeds indoors (fall) | Jul 29 – Aug 28 |
| Cabbage | Transplant outdoors (fall) | Aug 28 – Sep 28 |
| Leaf lettuce | Sow outdoors (spring) | Jan 13 – Mar 31 |
| Leaf lettuce | Sow outdoors (fall) | Aug 28 – Oct 14 |
| Spinach | Sow outdoors (spring) | Jan 6 – Feb 19 |
| Spinach | Sow outdoors (fall) | Sep 14 – Oct 19 |
| Radishes | Sow outdoors (spring) | Jan 13 – Mar 5 |
| Radishes | Sow outdoors (fall) | Aug 28 – Oct 29 |
| Kale | Sow outdoors (spring) | Jan 30 – Feb 19 |
| Kale | Sow outdoors (fall) | Aug 21 – Sep 28 |
| Carrots | Sow outdoors (spring) | Feb 13 – Mar 31 |
| Carrots | Sow outdoors (fall) | Jul 29 – Sep 13 |
| Garlic | Plant outdoors (fall) | Nov 28 – Dec 29 |
Where these dates come from
ZIP code 77480 is matched to the NOAA station Angleton Brazoria Ap, TX, 24.4 km away, at 25 ft elevation (8 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Angleton Brazoria Ap, TX (used) | 25 ft | Feb 13 | Dec 8 |
| Angleton 2 W, TX | 27 ft | Jan 29 | Dec 31 |
| Bay City Wtr Wks, TX | 52 ft | Feb 20 | Dec 3 |
| Freeport 2 Nw, TX | 8 ft | Jan 27 | Jan 1 |
Frost dates near Sweeny
- Old Ocean, TX 77463 · last Feb 20, first Dec 3
- Brazoria, TX 77422 · last Feb 13, first Dec 8
- West Columbia, TX 77486 · last Jan 29, first Dec 31
- Cedar Lane, TX 77415 · last Feb 20, first Dec 3
- Van Vleck, TX 77482 · last Feb 20, first Dec 3
- Danciger, TX 77431 · last Feb 20, first Dec 3
- Lake Jackson, TX 77566 · last Jan 27, first Jan 1
- Pledger, TX 77468 · last Feb 20, first Dec 3
Frequently asked questions
- When is the last frost in Sweeny, TX?
- For ZIP code 77480, the average last spring frost (32°F) is February 13, based on NOAA 1991-2020 climate normals for the Angleton Brazoria Ap, TX weather station. There is a 1-in-10 chance of a frost after March 17.
- When is the first frost in Sweeny, TX?
- The average first fall frost (32°F) is December 8. There is a 1-in-10 chance of frost by November 18, so tender plants are at risk from that point on.
- How long is the growing season in 77480?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 301 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.