When to plant in Portland, TX
USDA Zone 10aEverything below — frost dates, hardiness zone, and what to plant when in Portland, Texas — is derived from the closest NOAA station with complete climate normals.
A generous ~325-day season lets Portland gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. These dates come from a station roughly 21 km away, the closest with full normals; terrain around Portland (elevation, water, pavement) can move your real frost dates a few days either way. In zone 10a, frost is a minor factor for Portland — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
CORPUS CHRISTI NWS · 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 Portland’s own odds, recorded at CORPUS CHRISTI NWS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 12 | Feb 18 | Jan 18 | Nov 16 | Dec 7 | Jan 4 |
| 32°F | Mar 2 | Jan 31 | Dec 24 | Nov 29 | Dec 22 | Feb 1 |
| 28°F | Feb 17 | Jan 11 | Dec 13 | Dec 7 | Jan 1 | Feb 4 |
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 Portland, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 23 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.
Portland planting FAQ
When is the last spring frost in Portland, TX?
Plan for the last spring frost in Portland 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 Portland, TX?
In Portland, the first 32°F freeze of fall lands around December 22 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Portland in?
Portland is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Portland?
Portland has about 325 frost-free days — a long growing season — between the average last spring frost (January 31) and first fall frost (December 22).
When should I plant tomatoes in Portland?
For Portland, sow tomatoes indoors about December 6–December 20 and move the seedlings out around February 7, after the last spring frost.
Never miss a window in Portland
An email when it’s time to start seeds, transplant, and sow — timed to Portland’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Corpus Christi · 22 km
- Rockport · 33 km
- Robstown · 35 km
- Kingsville · 67 km
- Beeville · 70 km
- Alice · 74 km
- Port Lavaca · 106 km
- Victoria · 110 km
Frost dates recorded at CORPUS CHRISTI NWS, 21 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 Portland, TX — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00412011. Retrieved from https://blissgarden.com/texas/portland.