When to plant in Roma, TX
USDA Zone 9bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Roma, Texas — all computed from Roma's nearest NOAA weather station.
With about 320 frost-free days, Roma supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. Roma's nearest full-normals station sits about 20 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. Zone 9b is warm enough that Roma can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
RIO GRANDE CITY · 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 Roma’s own odds, recorded at RIO GRANDE CITY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 14 | Feb 22 | Jan 22 | Nov 11 | Dec 1 | Dec 28 |
| 32°F | Mar 4 | Jan 31 | Dec 29 | Nov 22 | Dec 17 | Jan 20 |
| 28°F | Feb 20 | Jan 12 | Dec 13 | Dec 2 | Dec 29 | Feb 1 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in Roma, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
2 within 21 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.
Roma planting FAQ
When is the last spring frost in Roma, TX?
Plan for the last spring frost in Roma around January 31 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Roma, TX?
In Roma, the first 32°F freeze of fall lands around December 17 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Roma in?
Roma is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Roma?
There are roughly 320 frost-free days in Roma (a long growing season), running from the average last frost around January 31 to the first fall frost near December 17.
When should I plant tomatoes in Roma?
In Roma, start tomato seeds indoors around December 6–December 20, then transplant seedlings outdoors around February 7 once the danger of frost has passed.
Never miss a window in Roma
An email when it’s time to start seeds, transplant, and sow — timed to Roma’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at RIO GRANDE CITY, 20 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 Roma, TX — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00417622. Retrieved from https://blissgarden.com/texas/roma.