When to plant in Rosenberg, TX
USDA Zone 9aRosenberg, Texas frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Rosenberg enjoys a long ~307-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. Rosenberg's nearest full-normals station sits about 18 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. Zone 9a is warm enough that Rosenberg can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
SUGAR LAND · 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 Rosenberg’s own odds, recorded at SUGAR LAND.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 25 | Mar 2 | Feb 2 | Nov 9 | Nov 29 | Dec 20 |
| 32°F | Mar 11 | Feb 9 | Jan 13 | Nov 19 | Dec 13 | Jan 13 |
| 28°F | Feb 28 | Jan 28 | Dec 26 | Nov 30 | 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 Rosenberg, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Rosenberg planting FAQ
When is the last spring frost in Rosenberg, TX?
Rosenberg's average last spring frost falls near February 9 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Rosenberg, TX?
The first fall frost in Rosenberg typically arrives around December 13 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Rosenberg in?
Rosenberg is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Rosenberg?
There are roughly 307 frost-free days in Rosenberg (a long growing season), running from the average last frost around February 9 to the first fall frost near December 13.
When should I plant tomatoes in Rosenberg?
In Rosenberg, start tomato seeds indoors around December 15–December 29, then transplant seedlings outdoors around February 16 once the danger of frost has passed.
Never miss a window in Rosenberg
An email when it’s time to start seeds, transplant, and sow — timed to Rosenberg’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Richmond · 7 km
- Pecan Grove · 12 km
- Fulshear · 17 km
- Sugar Land · 19 km
- Four Corners · 21 km
- Mission Bend · 22 km
- Cinco Ranch · 22 km
- Stafford · 26 km
Frost dates recorded at SUGAR LAND, 18 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 Rosenberg, TX — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00418728. Retrieved from https://blissgarden.com/texas/rosenberg.