When to plant in Katy, TX
USDA Zone 9aEverything below — frost dates, hardiness zone, and what to plant when in Katy, Texas — is derived from the closest NOAA station with complete climate normals.
Katy enjoys a long ~312-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. These dates come from a station roughly 26 km away, the closest with full normals; terrain around Katy (elevation, water, pavement) can move your real frost dates a few days either way. In zone 9a, frost is a minor factor for Katy — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
HOUSTON SUGARLAND MEM · 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 Katy’s own odds, recorded at HOUSTON SUGARLAND MEM.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 21 | Feb 26 | Jan 25 | Nov 7 | Nov 27 | Dec 24 |
| 32°F | Mar 7 | Feb 2 | Dec 28 | Nov 20 | Dec 11 | Jan 16 |
| 28°F | Feb 23 | Jan 18 | Dec 17 | Dec 4 | Jan 1 | Feb 2 |
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 Katy, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 30 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.
Katy planting FAQ
When is the last spring frost in Katy, TX?
Plan for the last spring frost in Katy around February 2 (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 Katy, TX?
In Katy, the first 32°F freeze of fall lands around December 11 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Katy in?
Katy is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Katy?
Katy has about 312 frost-free days — a long growing season — between the average last spring frost (February 2) and first fall frost (December 11).
When should I plant tomatoes in Katy?
For Katy, sow tomatoes indoors about December 8–December 22 and move the seedlings out around February 9, after the last spring frost.
Never miss a window in Katy
An email when it’s time to start seeds, transplant, and sow — timed to Katy’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Cinco Ranch · 10 km
- Fulshear · 12 km
- Mission Bend · 20 km
- Pecan Grove · 21 km
- Four Corners · 22 km
- Richmond · 25 km
- Rosenberg · 27 km
- Sugar Land · 30 km
Frost dates recorded at HOUSTON SUGARLAND MEM, 26 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 Katy, TX — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00012977. Retrieved from https://blissgarden.com/texas/katy.