Frost dates for 77306Conroe, TX
The average last spring frost in Conroe is March 11 and the average first fall frost is November 19, giving a typical growing season of about 253 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 11
- Average first fall frost
- Nov 19
- Growing season
- 253 days
Safer after Apr 3 (1-in-10 risk)
Possible by Nov 1 (1-in-10 risk)
First frost typically in 23 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) | Mar 3 · Mar 24 · Apr 15 | Oct 24 · Nov 8 · Nov 26 | 227 days | 100% |
| Frost / freeze (32°F) | Feb 14 · Mar 11 · Apr 3 | Nov 1 · Nov 19 · Dec 9 | 253 days | 100% |
| Hard freeze (28°F) | Jan 22 · Feb 21 · Mar 18 | Nov 11 · Dec 4 · Jan 8 | 291 days | 100% |
Planting calendar for Conroe
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 | Feb 8 – Apr 16 |
| Tomatoes | Transplant outdoors | Mar 27 – Jul 30 |
| Peppers | Start seeds indoors | Feb 8 – Mar 11 |
| Peppers | Transplant outdoors | Apr 10 – May 11 |
| Eggplant | Start seeds indoors | Feb 25 – Mar 26 |
| Eggplant | Transplant outdoors | Apr 10 – May 11 |
| Cucumbers | Sow outdoors | Apr 10 – Aug 9 |
| Summer squash | Sow outdoors | Mar 27 – May 11 |
| Winter squash & pumpkins | Sow outdoors | Apr 10 – May 11 |
| Snap beans | Sow outdoors | Mar 27 – Sep 1 |
| Sweet corn | Sow outdoors | Mar 27 – Jul 30 |
| Watermelon & cantaloupe | Sow outdoors | Apr 10 – May 11 |
| Okra | Sow outdoors | Apr 3 – Apr 26 |
| Peas | Sow outdoors (spring) | Feb 8 – Mar 26 |
| Potatoes | Plant outdoors (spring) | Feb 8 – Apr 10 |
| Onions | Start seeds indoors (spring) | Dec 28 – Jan 24 |
| Onions | Transplant outdoors (spring) | Feb 25 – Mar 26 |
| Broccoli | Start seeds indoors (spring) | Jan 21 – Feb 24 |
| Broccoli | Transplant outdoors (spring) | Feb 25 – Mar 26 |
| Broccoli | Start seeds indoors (fall) | Jul 20 – Jul 30 |
| Broccoli | Transplant outdoors (fall) | Aug 19 – Aug 30 |
| Cabbage | Start seeds indoors (spring) | Jan 11 – Feb 8 |
| Cabbage | Transplant outdoors (spring) | Feb 8 – Mar 11 |
| Cabbage | Start seeds indoors (fall) | Jul 10 – Aug 9 |
| Cabbage | Transplant outdoors (fall) | Aug 9 – Sep 9 |
| Leaf lettuce | Sow outdoors (spring) | Feb 8 – Apr 26 |
| Leaf lettuce | Sow outdoors (fall) | Aug 9 – Sep 25 |
| Spinach | Sow outdoors (spring) | Feb 1 – Mar 17 |
| Spinach | Sow outdoors (fall) | Aug 26 – Sep 30 |
| Radishes | Sow outdoors (spring) | Feb 8 – Mar 31 |
| Radishes | Sow outdoors (fall) | Aug 9 – Oct 10 |
| Kale | Sow outdoors (spring) | Feb 25 – Mar 17 |
| Kale | Sow outdoors (fall) | Aug 2 – Sep 9 |
| Carrots | Sow outdoors (spring) | Mar 11 – Apr 26 |
| Carrots | Sow outdoors (fall) | Jul 10 – Aug 25 |
| Garlic | Plant outdoors (fall) | Nov 9 – Dec 10 |
Where these dates come from
ZIP code 77306 is matched to the NOAA station Conroe Montgomery Co Ap, TX, 18.9 km away, at 245 ft elevation (117 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Conroe Montgomery Co Ap, TX (used) | 245 ft | Mar 11 | Nov 19 |
| Conroe, TX | 245 ft | Feb 24 | Dec 2 |
| Cleveland, TX | 196 ft | Mar 7 | Nov 20 |
| Houston Intercont Ap, TX | 95 ft | Feb 13 | Dec 9 |
Frost dates near Conroe
- Conroe, TX 77302 · last Mar 11, first Nov 19
- Splendora, TX 77372 · last Mar 7, first Nov 20
- New Caney, TX 77357 · last Feb 13, first Dec 9
- Porter, TX 77365 · last Feb 13, first Dec 9
- Spring, TX 77386 · last Feb 19, first Dec 3
- Cleveland, TX 77328 · last Mar 7, first Nov 20
- Kingwood, TX 77325 · last Feb 13, first Dec 9
- Humble, TX 77338 · last Feb 13, first Dec 9
Frequently asked questions
- When is the last frost in Conroe, TX?
- For ZIP code 77306, the average last spring frost (32°F) is March 11, based on NOAA 1991-2020 climate normals for the Conroe Montgomery Co Ap, TX weather station. There is a 1-in-10 chance of a frost after April 3.
- When is the first frost in Conroe, TX?
- The average first fall frost (32°F) is November 19. There is a 1-in-10 chance of frost by November 1, so tender plants are at risk from that point on.
- How long is the growing season in 77306?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 253 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.