Armstrong, TX frost dates
Last spring frostFeb 22median date
First fall frostDec 5median date
Growing season286 daysfrost-free
Hardiness zone9bZone 9b
How Armstrong compares
- In 8 years out of 10, the last spring frost in Armstrong falls between January 19 and March 14, a 54-day window. The first fall frost falls between November 15 and January 6.
- The median last frost is 21 days earlier than the Texas median of Mar 15.
- Its 286-day growing season is longer than 92% of the 1,316 Texas places with a regular frost season (state median 245 days).
- The last frost is typical for zone 9b, where the median is Feb 20.
- The weather station records an average of 11 nights a year at or below 32°F.
- Nearby Edinburg, TX, 68 km away, gets only light, occasional frost, a reminder of how much elevation and distance from the coast matter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 19 |
| 50% (median) | February 22 |
| 10% (safe for tender plants) | March 14 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 15 |
| 50% (median) | December 5 |
| 90% (late) | January 6 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Armstrong, TX
Armstrong, TX frost dates — last frost Feb 22, first frost Dec 5, zone 9b. whenisthelastfrost.com
Crop
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Start indoors: Nov 30 to Dec 14Transplant outside: Jan 25 to Feb 8
Start indoors: Dec 14 to Dec 28Transplant outside: Mar 8 to Mar 22
Start indoors: Dec 14 to Dec 28Transplant outside: Mar 8 to Mar 22
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Mar 1 to Mar 15
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Feb 1 to Feb 15Sow outdoors: Jan 25 to Mar 1Plant for fall: Oct 10 to Nov 7
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Jan 25 to Feb 8Sow outdoors: Jan 25 to Feb 8Plant for fall: Sep 26 to Oct 17
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Feb 8 to Feb 22Plant for fall: Aug 29 to Sep 19
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Feb 1 to Feb 15Plant for fall: Aug 29 to Sep 19
Start indoors: Dec 28 to Jan 11Start indoors: Dec 28 to Jan 11Transplant outside: Feb 8 to Feb 22Plant for fall: Aug 29 to Sep 19
Start indoors: Jan 11 to Jan 25Transplant outside: Mar 15 to Mar 29Sow outdoors: Mar 15 to Mar 29
Start indoors: Jan 11 to Jan 25Transplant outside: Mar 1 to Mar 15
Sow outdoors: Jan 11 to Feb 1Plant for fall: Sep 12 to Oct 3
Sow outdoors: Jan 11 to Feb 1Plant for fall: Oct 10 to Oct 31
Sow outdoors: Jan 18 to Mar 1Plant for fall: Oct 24 to Nov 14
Start indoors: Jan 25 to Feb 1Transplant outside: Mar 8 to Mar 15Sow outdoors: Mar 1 to Mar 15Plant for fall: Sep 19 to Oct 3
Start indoors: Jan 25 to Feb 1Sow outdoors: Mar 1 to Mar 15Plant for fall: Sep 26 to Oct 10
Start indoors: Jan 25 to Feb 1Sow outdoors: Mar 1 to Mar 15
Start indoors: Jan 25 to Feb 1Transplant outside: Mar 8 to Mar 22
Sow outdoors: Feb 1 to Mar 1Plant for fall: Sep 12 to Sep 26
Sow outdoors: Feb 1 to Mar 1Plant for fall: Sep 26 to Oct 10
Sow outdoors: Feb 1 to Feb 22
Sow outdoors: Feb 8 to Mar 8Plant for fall: Sep 26 to Oct 10
Sow outdoors: Feb 8 to Mar 1Plant for fall: Oct 10 to Oct 31
Sow outdoors: Mar 1 to Mar 22Plant for fall: Sep 19 to Oct 3
Sow outdoors: Mar 1 to Mar 15
Transplant outside: Mar 8 to Mar 29
Plant for fall: Nov 21 to Dec 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Armstrong, TX
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 30 – Dec 14 | Jan 25 – Feb 8 | — | — |
| Peppers | Dec 14 – Dec 28 | Mar 8 – Mar 22 | — | — |
| Eggplant | Dec 14 – Dec 28 | Mar 8 – Mar 22 | — | — |
| Tomatoes | Dec 28 – Jan 11 | Mar 1 – Mar 15 | — | — |
| Lettuce | Dec 28 – Jan 11 | Feb 1 – Feb 15 | Jan 25 – Mar 1 | Oct 10 – Nov 7 |
| Kale | Dec 28 – Jan 11 | Jan 25 – Feb 8 | Jan 25 – Feb 8 | Sep 26 – Oct 17 |
| Broccoli | Dec 28 – Jan 11 | Feb 8 – Feb 22 | — | Aug 29 – Sep 19 |
| Cabbage | Dec 28 – Jan 11 | Feb 1 – Feb 15 | — | Aug 29 – Sep 19 |
| Cauliflower | Dec 28 – Jan 11 | Feb 8 – Feb 22 | — | Aug 29 – Sep 19 |
| Okra | Jan 11 – Jan 25 | Mar 15 – Mar 29 | Mar 15 – Mar 29 | — |
| Basil | Jan 11 – Jan 25 | Mar 1 – Mar 15 | — | — |
| Peas | — | — | Jan 11 – Feb 1 | Sep 12 – Oct 3 |
| Spinach | — | — | Jan 11 – Feb 1 | Oct 10 – Oct 31 |
| Radishes | — | — | Jan 18 – Mar 1 | Oct 24 – Nov 14 |
| Cucumbers | Jan 25 – Feb 1 | Mar 8 – Mar 15 | Mar 1 – Mar 15 | Sep 19 – Oct 3 |
| Zucchini & Summer Squash | Jan 25 – Feb 1 | — | Mar 1 – Mar 15 | Sep 26 – Oct 10 |
| Winter Squash & Pumpkins | Jan 25 – Feb 1 | — | Mar 1 – Mar 15 | — |
| Melons & Watermelon | Jan 25 – Feb 1 | Mar 8 – Mar 22 | — | — |
| Carrots | — | — | Feb 1 – Mar 1 | Sep 12 – Sep 26 |
| Beets | — | — | Feb 1 – Mar 1 | Sep 26 – Oct 10 |
| Potatoes | — | — | Feb 1 – Feb 22 | — |
| Swiss Chard | — | — | Feb 8 – Mar 8 | Sep 26 – Oct 10 |
| Cilantro | — | — | Feb 8 – Mar 1 | Oct 10 – Oct 31 |
| Green Beans | — | — | Mar 1 – Mar 22 | Sep 19 – Oct 3 |
| Sweet Corn | — | — | Mar 1 – Mar 15 | — |
| Sweet Potatoes | — | Mar 8 – Mar 29 | — | — |
| Garlic | — | — | — | Nov 21 – Dec 26 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Armstrong 4se, TX weather station, 7 km away (elevation 26 ft (8 m)).
Frost dates near Armstrong
- Sarita Feb 17 · Dec 8
- Encino Feb 25 · Dec 1
- San Perlita Jan 21 · Dec 26
- Raymondville Jan 21 · Dec 26
- Lasara Jan 21 · Dec 26
- Port Mansfield Jan 12 · Jan 1
- Riviera Feb 17 · Dec 8
- Lyford Jan 21 · Dec 26
- Hargill Jan 21 · Dec 23
- Falfurrias Feb 25 · Dec 1
Frequently asked questions
When is the last frost in Armstrong, TX?
The median last spring frost in Armstrong, TX is February 22. There is still about a 10% chance of frost after March 14, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Armstrong, TX?
The median first fall frost is December 5, with about a 10% chance of frost before November 15.
How long is the growing season in Armstrong, TX?
About 286 days between the median last spring frost and first fall frost.
What planting zone is Armstrong, TX?
Armstrong, TX is in USDA hardiness zone 9b.