Harper, TX frost dates
Last spring frostMar 15median date
First fall frostNov 15median date
Growing season245 daysfrost-free
Hardiness zone8aZone 8a
How Harper compares
- In 8 years out of 10, the last spring frost in Harper falls between February 24 and April 12, a 47-day window. The first fall frost falls between October 27 and December 6.
- The median last frost is the same as the Texas median of Mar 15.
- Its 245-day growing season is longer than 49% of the 1,316 Texas places with a regular frost season (state median 245 days).
- The last frost is 14 days earlier than the zone 8a median of Mar 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8a chart.
- The weather station records an average of 41 nights a year at or below 32°F.
- Compared with San Antonio, TX, 116 km away, the last frost here is 18 days later than there and the growing season is 31 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 24 |
| 50% (median) | March 15 |
| 10% (safe for tender plants) | April 12 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 27 |
| 50% (median) | November 15 |
| 90% (late) | December 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 Harper, TX
Harper, TX frost dates — last frost Mar 15, first frost Nov 15, zone 8a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 21 to Jan 4Start indoors: Dec 21 to Jan 4Transplant outside: Feb 15 to Mar 1
Start indoors: Jan 4 to Jan 18Transplant outside: Mar 29 to Apr 12
Start indoors: Jan 4 to Jan 18Transplant outside: Mar 29 to Apr 12
Start indoors: Jan 18 to Feb 1Transplant outside: Mar 22 to Apr 5
Start indoors: Jan 18 to Feb 1Transplant outside: Feb 22 to Mar 8Sow outdoors: Feb 15 to Mar 22Plant for fall: Sep 20 to Oct 18
Start indoors: Jan 18 to Feb 1Transplant outside: Feb 15 to Mar 1Sow outdoors: Feb 15 to Mar 1Plant for fall: Sep 6 to Sep 27
Start indoors: Jan 18 to Feb 1Transplant outside: Mar 1 to Mar 15Plant for fall: Aug 9 to Aug 30
Start indoors: Jan 18 to Feb 1Transplant outside: Feb 22 to Mar 8Plant for fall: Aug 9 to Aug 30
Start indoors: Jan 18 to Feb 1Transplant outside: Mar 1 to Mar 15Plant for fall: Aug 9 to Aug 30
Start indoors: Feb 1 to Feb 15Transplant outside: Apr 5 to Apr 19Sow outdoors: Apr 5 to Apr 19
Start indoors: Feb 1 to Feb 15Transplant outside: Mar 22 to Apr 5
Sow outdoors: Feb 1 to Feb 22Plant for fall: Aug 23 to Sep 13
Sow outdoors: Feb 1 to Feb 22Plant for fall: Sep 20 to Oct 11
Sow outdoors: Feb 8 to Mar 22Plant for fall: Oct 4 to Oct 25
Start indoors: Feb 15 to Feb 22Transplant outside: Mar 29 to Apr 5Sow outdoors: Mar 22 to Apr 5Plant for fall: Aug 30 to Sep 13
Start indoors: Feb 15 to Feb 22Sow outdoors: Mar 22 to Apr 5Plant for fall: Sep 6 to Sep 20
Start indoors: Feb 15 to Feb 22Sow outdoors: Mar 22 to Apr 5
Start indoors: Feb 15 to Feb 22Transplant outside: Mar 29 to Apr 12
Sow outdoors: Feb 22 to Mar 22Plant for fall: Aug 23 to Sep 6
Sow outdoors: Feb 22 to Mar 22Plant for fall: Sep 6 to Sep 20
Sow outdoors: Feb 22 to Mar 15
Sow outdoors: Mar 1 to Mar 29Plant for fall: Sep 6 to Sep 20
Sow outdoors: Mar 1 to Mar 22Plant for fall: Sep 20 to Oct 11
Sow outdoors: Mar 22 to Apr 12Plant for fall: Aug 30 to Sep 13
Sow outdoors: Mar 22 to Apr 5
Transplant outside: Mar 29 to Apr 19
Plant for fall: Nov 1 to Dec 6
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Harper, TX
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 21 – Jan 4 | Feb 15 – Mar 1 | — | — |
| Peppers | Jan 4 – Jan 18 | Mar 29 – Apr 12 | — | — |
| Eggplant | Jan 4 – Jan 18 | Mar 29 – Apr 12 | — | — |
| Tomatoes | Jan 18 – Feb 1 | Mar 22 – Apr 5 | — | — |
| Lettuce | Jan 18 – Feb 1 | Feb 22 – Mar 8 | Feb 15 – Mar 22 | Sep 20 – Oct 18 |
| Kale | Jan 18 – Feb 1 | Feb 15 – Mar 1 | Feb 15 – Mar 1 | Sep 6 – Sep 27 |
| Broccoli | Jan 18 – Feb 1 | Mar 1 – Mar 15 | — | Aug 9 – Aug 30 |
| Cabbage | Jan 18 – Feb 1 | Feb 22 – Mar 8 | — | Aug 9 – Aug 30 |
| Cauliflower | Jan 18 – Feb 1 | Mar 1 – Mar 15 | — | Aug 9 – Aug 30 |
| Okra | Feb 1 – Feb 15 | Apr 5 – Apr 19 | Apr 5 – Apr 19 | — |
| Basil | Feb 1 – Feb 15 | Mar 22 – Apr 5 | — | — |
| Peas | — | — | Feb 1 – Feb 22 | Aug 23 – Sep 13 |
| Spinach | — | — | Feb 1 – Feb 22 | Sep 20 – Oct 11 |
| Radishes | — | — | Feb 8 – Mar 22 | Oct 4 – Oct 25 |
| Cucumbers | Feb 15 – Feb 22 | Mar 29 – Apr 5 | Mar 22 – Apr 5 | Aug 30 – Sep 13 |
| Zucchini & Summer Squash | Feb 15 – Feb 22 | — | Mar 22 – Apr 5 | Sep 6 – Sep 20 |
| Winter Squash & Pumpkins | Feb 15 – Feb 22 | — | Mar 22 – Apr 5 | — |
| Melons & Watermelon | Feb 15 – Feb 22 | Mar 29 – Apr 12 | — | — |
| Carrots | — | — | Feb 22 – Mar 22 | Aug 23 – Sep 6 |
| Beets | — | — | Feb 22 – Mar 22 | Sep 6 – Sep 20 |
| Potatoes | — | — | Feb 22 – Mar 15 | — |
| Swiss Chard | — | — | Mar 1 – Mar 29 | Sep 6 – Sep 20 |
| Cilantro | — | — | Mar 1 – Mar 22 | Sep 20 – Oct 11 |
| Green Beans | — | — | Mar 22 – Apr 12 | Aug 30 – Sep 13 |
| Sweet Corn | — | — | Mar 22 – Apr 5 | — |
| Sweet Potatoes | — | Mar 29 – Apr 19 | — | — |
| Garlic | — | — | — | Nov 1 – Dec 6 |
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 Harper 3ene, TX weather station, 5 km away (elevation 2,110 ft (643 m)).
Frost dates near Harper
- Doss Mar 15 · Nov 15
- Ingram Mar 27 · Nov 7
- Mountain Home Apr 3 · Nov 1
- Kerrville Mar 27 · Nov 7
- Fredericksburg Mar 18 · Nov 10
- Hunt Apr 3 · Nov 1
- Center Point Mar 27 · Nov 7
- Comfort Mar 27 · Nov 7
- Medina Mar 16 · Nov 15
- Mason Mar 18 · Nov 13
Frequently asked questions
When is the last frost in Harper, TX?
The median last spring frost in Harper, TX is March 15. There is still about a 10% chance of frost after April 12, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Harper, TX?
The median first fall frost is November 15, with about a 10% chance of frost before October 27.
How long is the growing season in Harper, TX?
About 245 days between the median last spring frost and first fall frost.
What planting zone is Harper, TX?
Harper, TX is in USDA hardiness zone 8a.