When to plant in Del Rio, TX
USDA Zone 9aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Del Rio, Texas — all computed from Del Rio's nearest NOAA weather station.
Del Rio enjoys a long ~290-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. In zone 9a, frost is a minor factor for Del Rio — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
DEL RIO INTL AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Del Rio’s own odds, recorded at DEL RIO INTL AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 24 | Mar 3 | Feb 10 | Nov 4 | Nov 20 | Dec 5 |
| 32°F | Mar 10 | Feb 16 | Jan 19 | Nov 14 | Dec 3 | Dec 26 |
| 28°F | Feb 26 | Jan 24 | Dec 23 | Nov 27 | Dec 18 | Jan 19 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Del Rio, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Del Rio planting FAQ
When is the last spring frost in Del Rio, TX?
Del Rio's average last spring frost falls near February 16 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Del Rio, TX?
Expect Del Rio's first fall frost near December 3 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Del Rio in?
Del Rio is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Del Rio?
Del Rio has about 290 frost-free days — a long growing season — between the average last spring frost (February 16) and first fall frost (December 3).
When should I plant tomatoes in Del Rio?
For Del Rio, sow tomatoes indoors about December 22–January 5 and move the seedlings out around February 23, after the last spring frost.
Never miss a window in Del Rio
An email when it’s time to start seeds, transplant, and sow — timed to Del Rio’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Eagle Pass · 84 km
- Kerrville · 185 km
- Boerne · 213 km
- Scenic Oaks · 217 km
- Fredericksburg · 218 km
- Leon Valley · 220 km
- Fair Oaks Ranch · 221 km
- San Antonio · 229 km
Frost dates recorded at DEL RIO INTL AP, 4 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Del Rio, TX — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00022010. Retrieved from https://blissgarden.com/texas/del-rio.