Frost Dates for Round Rock, TX
In Round Rock, TX, the average last spring frost is around Mar 11 and the average first fall frost around Nov 20, for a growing season of about 254 days. For frost-tender plants, wait until Mar 29, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Austin Great Hills, TX weather station, 10 miles away, elevation 880 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | Mar 29 | Nov 3 |
| 20% | Mar 23 | Nov 9 |
| 30% | Mar 19 | Nov 13 |
| 40% | Mar 15 | Nov 16 |
| 50% | Mar 11 | Nov 20 |
| 60% | Mar 7 | Nov 24 |
| 70% | Mar 4 | Nov 28 |
| 80% | Feb 28 | Dec 2 |
| 90% | Feb 22 | Dec 9 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | Mar 25 | Nov 10 |
| Frost / freeze (32°F) | Mar 11 | Nov 20 |
| Hard freeze (28°F) | Mar 1 | Dec 3 |
Planting calendar for Round Rock
Transplant Mar 18 – Apr 1
Transplant Mar 25 – Apr 8
Transplant Mar 25 – Apr 8
Transplant Mar 18 – Apr 1
Sow or transplant Mar 18 – Apr 1
Sow or transplant Mar 18 – Apr 1
Sow or transplant Mar 25 – Apr 8
Sow or transplant Feb 11 – Feb 25
Fall sowing Sep 25 – Oct 23
Fall sowing Sep 25 – Oct 16
Fall sowing Sep 11 – Sep 25
Sow or transplant Feb 11 – Feb 25
Fall sowing Sep 11 – Oct 9
Transplant Feb 25 – Mar 11
Fall sowing Aug 28 – Sep 11
Transplant Feb 18 – Mar 4
Fall sowing Aug 28 – Sep 11
Fall sowing Aug 28 – Sep 11
Fall sowing Oct 9 – Oct 30
Fall sowing Sep 11 – Sep 25
Plant Feb 11 – Feb 25
Based on the average last frost (Mar 11) and first frost (Nov 20). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.