When to plant in Mercedes, TX
USDA Zone 10aMercedes, Texas frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
With about 357 frost-free days, Mercedes supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. In zone 10a, frost is a minor factor for Mercedes — most perennials thrive, and annual vegetables can go out early and stay late.
The average last spring frost in Mercedes is now 10 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
WESLACO · 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 Mercedes’s own odds, recorded at WESLACO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 1 | Jan 28 | Dec 18 | Nov 25 | Dec 19 | Jan 27 |
| 32°F | Feb 18 | Jan 8 | Dec 8 | Dec 3 | Dec 31 | Feb 7 |
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 Mercedes, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 25 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.
Mercedes planting FAQ
When is the last spring frost in Mercedes, TX?
Plan for the last spring frost in Mercedes around January 8 (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 Mercedes, TX?
In Mercedes, the first 32°F freeze of fall lands around December 31 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Mercedes in?
Mercedes is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Mercedes?
Mercedes has about 357 frost-free days — a long growing season — between the average last spring frost (January 8) and first fall frost (December 31).
When should I plant tomatoes in Mercedes?
For Mercedes, sow tomatoes indoors about November 13–November 27 and move the seedlings out around January 15, after the last spring frost.
Never miss a window in Mercedes
An email when it’s time to start seeds, transplant, and sow — timed to Mercedes’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at WESLACO, 6 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 Mercedes, TX — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00419588. Retrieved from https://blissgarden.com/texas/mercedes.