When to plant in La Porte, TX
USDA Zone 9bEverything below — frost dates, hardiness zone, and what to plant when in La Porte, Texas — is derived from the closest NOAA station with complete climate normals.
A generous ~317-day season lets La Porte gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. These dates come from a station roughly 22 km away, the closest with full normals; terrain around La Porte (elevation, water, pavement) can move your real frost dates a few days either way. Zone 9b is warm enough that La Porte can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
The average last spring frost in La Porte is now 12 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
HOUSTON NWSO · 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 La Porte’s own odds, recorded at HOUSTON NWSO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 17 | Feb 22 | Jan 21 | Nov 9 | Nov 29 | Dec 22 |
| 32°F | Mar 5 | Jan 31 | Dec 25 | Nov 19 | Dec 14 | Jan 19 |
| 28°F | Feb 24 | Jan 17 | Dec 19 | Dec 6 | Jan 3 | Feb 5 |
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 La Porte, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 24 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.
La Porte planting FAQ
When is the last spring frost in La Porte, TX?
Plan for the last spring frost in La Porte 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 La Porte, TX?
In La Porte, the first 32°F freeze of fall lands around December 14 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is La Porte in?
La Porte is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in La Porte?
There are roughly 317 frost-free days in La Porte (a long growing season), running from the average last frost around January 31 to the first fall frost near December 14.
When should I plant tomatoes in La Porte?
In La Porte, 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 La Porte
An email when it’s time to start seeds, transplant, and sow — timed to La Porte’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Deer Park · 7 km
- Seabrook · 10 km
- Pasadena · 10 km
- Baytown · 13 km
- Channelview · 15 km
- Webster · 16 km
- South Houston · 17 km
- Cloverleaf · 18 km
Frost dates recorded at HOUSTON NWSO, 22 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 La Porte, TX — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00414333. Retrieved from https://blissgarden.com/texas/la-porte.