When to plant in Harker Heights, TX
USDA Zone 8bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Harker Heights, Texas — all computed from Harker Heights's nearest NOAA weather station.
With about 248 frost-free days, Harker Heights supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. Zone 8b means many perennials and even some tender shrubs overwinter in Harker Heights, while your frost dates still decide when annuals go out.
Frost probability
KILLEEN · 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 Harker Heights’s own odds, recorded at KILLEEN.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 19 | Mar 31 | Mar 7 | Oct 24 | Nov 7 | Nov 26 |
| 32°F | Apr 4 | Mar 14 | Feb 24 | Nov 1 | Nov 17 | Dec 6 |
| 28°F | Mar 22 | Mar 2 | Feb 5 | Nov 8 | Nov 30 | Dec 22 |
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 Harker Heights, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 40 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.
Harker Heights planting FAQ
When is the last spring frost in Harker Heights, TX?
On average, the last spring frost in Harker Heights is around March 14 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Harker Heights, TX?
In Harker Heights, the first 32°F freeze of fall lands around November 17 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Harker Heights in?
Harker Heights is in USDA hardiness zone 8b. In zone 8b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Harker Heights?
There are roughly 248 frost-free days in Harker Heights (a long growing season), running from the average last frost around March 14 to the first fall frost near November 17.
When should I plant tomatoes in Harker Heights?
In Harker Heights, start tomato seeds indoors around January 17–January 31, then transplant seedlings outdoors around March 21 once the danger of frost has passed.
Never miss a window in Harker Heights
An email when it’s time to start seeds, transplant, and sow — timed to Harker Heights’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Killeen · 9 km
- Belton · 16 km
- Temple · 25 km
- Copperas Cove · 27 km
- Sonterra · 28 km
- Georgetown · 44 km
- Gatesville · 44 km
- Leander · 58 km
Frost dates recorded at KILLEEN, 5 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 Harker Heights, TX — Frost Dates & Zone 8b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00414792. Retrieved from https://blissgarden.com/texas/harker-heights.