Frost dates for 78664 — Round Rock, TX
Last spring frostMar 11median date
First fall frostNov 20median date
Growing season254 daysfrost-free
Hardiness zone9aZone 9a
How Round Rock compares
- In 8 years out of 10, the last spring frost in Round Rock falls between February 22 and March 29, a 35-day window. The first fall frost falls between November 3 and December 9.
- The median last frost is 4 days earlier than the Texas median of Mar 15.
- Its 254-day growing season is longer than 63% of the 1,316 Texas places with a regular frost season (state median 245 days).
- The last frost is 8 days later than the zone 9a median of Mar 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9a chart.
- The weather station records an average of 27 nights a year at or below 32°F.
- Compared with Austin, TX, 25 km away, the last frost here is 19 days later than there and the growing season is 32 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 22 |
| 50% (median) | March 11 |
| 10% (safe for tender plants) | March 29 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 3 |
| 50% (median) | November 20 |
| 90% (late) | December 9 |
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 Round Rock, TX
Frost dates for 78664 — Round Rock, TX — last frost Mar 11, first frost Nov 20, zone 9a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Dec 17 to Dec 31Transplant outside: Feb 11 to Feb 25
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Mar 25 to Apr 8
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Mar 25 to Apr 8
Start indoors: Jan 14 to Jan 28Transplant outside: Mar 18 to Apr 1
Start indoors: Jan 14 to Jan 28Transplant outside: Feb 18 to Mar 4Sow outdoors: Feb 11 to Mar 18Plant for fall: Sep 25 to Oct 23
Start indoors: Jan 14 to Jan 28Transplant outside: Feb 11 to Feb 25Sow outdoors: Feb 11 to Feb 25Plant for fall: Sep 11 to Oct 2
Start indoors: Jan 14 to Jan 28Transplant outside: Feb 25 to Mar 11Plant for fall: Aug 14 to Sep 4
Start indoors: Jan 14 to Jan 28Transplant outside: Feb 18 to Mar 4Plant for fall: Aug 14 to Sep 4
Start indoors: Jan 14 to Jan 28Transplant outside: Feb 25 to Mar 11Plant for fall: Aug 14 to Sep 4
Start indoors: Jan 28 to Feb 11Transplant outside: Apr 1 to Apr 15Sow outdoors: Apr 1 to Apr 15
Start indoors: Jan 28 to Feb 11Transplant outside: Mar 18 to Apr 1
Sow outdoors: Jan 28 to Feb 18Plant for fall: Aug 28 to Sep 18
Sow outdoors: Jan 28 to Feb 18Plant for fall: Sep 25 to Oct 16
Sow outdoors: Feb 4 to Mar 18Plant for fall: Oct 9 to Oct 30
Start indoors: Feb 11 to Feb 18Transplant outside: Mar 25 to Apr 1Sow outdoors: Mar 18 to Apr 1Plant for fall: Sep 4 to Sep 18
Start indoors: Feb 11 to Feb 18Sow outdoors: Mar 18 to Apr 1Plant for fall: Sep 11 to Sep 25
Start indoors: Feb 11 to Feb 18Sow outdoors: Mar 18 to Apr 1
Start indoors: Feb 11 to Feb 18Transplant outside: Mar 25 to Apr 8
Sow outdoors: Feb 18 to Mar 18Plant for fall: Aug 28 to Sep 11
Sow outdoors: Feb 18 to Mar 18Plant for fall: Sep 11 to Sep 25
Sow outdoors: Feb 18 to Mar 11
Sow outdoors: Feb 25 to Mar 25Plant for fall: Sep 11 to Sep 25
Sow outdoors: Feb 25 to Mar 18Plant for fall: Sep 25 to Oct 16
Sow outdoors: Mar 18 to Apr 8Plant for fall: Sep 4 to Sep 18
Sow outdoors: Mar 18 to Apr 1
Transplant outside: Mar 25 to Apr 15
Plant for fall: Nov 6 to Dec 11
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Round Rock, TX
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 17 – Dec 31 | Feb 11 – Feb 25 | — | — |
| Peppers | Dec 31 – Jan 14 | Mar 25 – Apr 8 | — | — |
| Eggplant | Dec 31 – Jan 14 | Mar 25 – Apr 8 | — | — |
| Tomatoes | Jan 14 – Jan 28 | Mar 18 – Apr 1 | — | — |
| Lettuce | Jan 14 – Jan 28 | Feb 18 – Mar 4 | Feb 11 – Mar 18 | Sep 25 – Oct 23 |
| Kale | Jan 14 – Jan 28 | Feb 11 – Feb 25 | Feb 11 – Feb 25 | Sep 11 – Oct 2 |
| Broccoli | Jan 14 – Jan 28 | Feb 25 – Mar 11 | — | Aug 14 – Sep 4 |
| Cabbage | Jan 14 – Jan 28 | Feb 18 – Mar 4 | — | Aug 14 – Sep 4 |
| Cauliflower | Jan 14 – Jan 28 | Feb 25 – Mar 11 | — | Aug 14 – Sep 4 |
| Okra | Jan 28 – Feb 11 | Apr 1 – Apr 15 | Apr 1 – Apr 15 | — |
| Basil | Jan 28 – Feb 11 | Mar 18 – Apr 1 | — | — |
| Peas | — | — | Jan 28 – Feb 18 | Aug 28 – Sep 18 |
| Spinach | — | — | Jan 28 – Feb 18 | Sep 25 – Oct 16 |
| Radishes | — | — | Feb 4 – Mar 18 | Oct 9 – Oct 30 |
| Cucumbers | Feb 11 – Feb 18 | Mar 25 – Apr 1 | Mar 18 – Apr 1 | Sep 4 – Sep 18 |
| Zucchini & Summer Squash | Feb 11 – Feb 18 | — | Mar 18 – Apr 1 | Sep 11 – Sep 25 |
| Winter Squash & Pumpkins | Feb 11 – Feb 18 | — | Mar 18 – Apr 1 | — |
| Melons & Watermelon | Feb 11 – Feb 18 | Mar 25 – Apr 8 | — | — |
| Carrots | — | — | Feb 18 – Mar 18 | Aug 28 – Sep 11 |
| Beets | — | — | Feb 18 – Mar 18 | Sep 11 – Sep 25 |
| Potatoes | — | — | Feb 18 – Mar 11 | — |
| Swiss Chard | — | — | Feb 25 – Mar 25 | Sep 11 – Sep 25 |
| Cilantro | — | — | Feb 25 – Mar 18 | Sep 25 – Oct 16 |
| Green Beans | — | — | Mar 18 – Apr 8 | Sep 4 – Sep 18 |
| Sweet Corn | — | — | Mar 18 – Apr 1 | — |
| Sweet Potatoes | — | Mar 25 – Apr 15 | — | — |
| Garlic | — | — | — | Nov 6 – Dec 11 |
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 Austin Great Hills, TX weather station, 15 km away (elevation 879 ft (268 m)).
ZIP codes in Round Rock: 78664 78665 78680 78681 78682 78683
Frost dates near Round Rock
- Pflugerville Mar 11 · Nov 20
- Hutto Mar 8 · Nov 21
- Cedar Park Mar 11 · Nov 20
- Georgetown Mar 6 · Nov 24
- Weir Mar 6 · Nov 24
- Leander Mar 11 · Nov 20
- Mc Neil Feb 20 · Dec 3
- Manor Mar 4 · Nov 24
Frequently asked questions
When is the last frost in Round Rock, TX?
The median last spring frost in Round Rock, TX is March 11. There is still about a 10% chance of frost after March 29, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Round Rock, TX?
The median first fall frost is November 20, with about a 10% chance of frost before November 3.
How long is the growing season in Round Rock, TX?
About 254 days between the median last spring frost and first fall frost.
What planting zone is Round Rock, TX?
Round Rock, TX is in USDA hardiness zone 9a.