When to plant in Richardson, TX
USDA Zone 8bRichardson, Texas frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Richardson enjoys a long ~259-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. Zone 8b means many perennials and even some tender shrubs overwinter in Richardson, while your frost dates still decide when annuals go out.
Frost probability
RICHARDSON · 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 Richardson’s own odds, recorded at RICHARDSON.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 11 | Mar 21 | Mar 2 | Oct 23 | Nov 10 | Nov 27 |
| 32°F | Mar 29 | Mar 7 | Feb 18 | Nov 2 | Nov 21 | Dec 9 |
| 28°F | Mar 12 | Feb 24 | Jan 27 | Nov 14 | Dec 4 | Dec 26 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Richardson, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Richardson planting FAQ
When is the last spring frost in Richardson, TX?
Plan for the last spring frost in Richardson around March 7 (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 Richardson, TX?
In Richardson, the first 32°F freeze of fall lands around November 21 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Richardson in?
Richardson is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Richardson?
There are roughly 259 frost-free days in Richardson (a long growing season), running from the average last frost around March 7 to the first fall frost near November 21.
When should I plant tomatoes in Richardson?
In Richardson, start tomato seeds indoors around January 10–January 24, then transplant seedlings outdoors around March 14 once the danger of frost has passed.
Never miss a window in Richardson
An email when it’s time to start seeds, transplant, and sow — timed to Richardson’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at RICHARDSON, 4 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 Richardson, TX — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00417588. Retrieved from https://blissgarden.com/texas/richardson.