When to plant in Helena, AL
USDA Zone 8aEverything below — frost dates, hardiness zone, and what to plant when in Helena, Alabama — is derived from the closest NOAA station with complete climate normals.
In zone 8a, Helena supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
HELENA · 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 Helena’s own odds, recorded at HELENA.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 21 | Apr 3 | Mar 15 | Oct 17 | Oct 30 | Nov 13 |
| 32°F | Apr 9 | Mar 19 | Feb 26 | Oct 26 | Nov 8 | Nov 29 |
| 28°F | Mar 25 | Mar 4 | Feb 8 | Nov 3 | Nov 22 | Dec 13 |
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 Helena, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 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.
Helena planting FAQ
When is the last spring frost in Helena, AL?
On average, the last spring frost in Helena is around March 19 (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 Helena, AL?
The first fall frost in Helena typically arrives around November 8 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Helena in?
Helena is in USDA hardiness zone 8a. In zone 8a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Helena?
Helena has about 234 frost-free days — a long growing season — between the average last spring frost (March 19) and first fall frost (November 8).
When should I plant tomatoes in Helena?
For Helena, sow tomatoes indoors about January 22–February 5 and move the seedlings out around March 26, after the last spring frost.
Never miss a window in Helena
An email when it’s time to start seeds, transplant, and sow — timed to Helena’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at HELENA, 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 Helena, AL — Frost Dates & Zone 8a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00013781. Retrieved from https://blissgarden.com/alabama/helena.