When to plant in Irondale, AL
USDA Zone 8aIrondale, Alabama frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 8a means many perennials and even some tender shrubs overwinter in Irondale, while your frost dates still decide when annuals go out.
The average last spring frost in Irondale is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
BIRMINGHAM AP · 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 Irondale’s own odds, recorded at BIRMINGHAM AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 20 | Apr 3 | Mar 16 | Oct 21 | Nov 2 | Nov 17 |
| 32°F | Apr 8 | Mar 21 | Feb 28 | Oct 30 | Nov 11 | Dec 1 |
| 28°F | Mar 26 | Mar 7 | Feb 14 | Nov 6 | Nov 24 | Dec 15 |
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 Irondale, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 34 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.
Irondale planting FAQ
When is the last spring frost in Irondale, AL?
Plan for the last spring frost in Irondale around March 21 (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 Irondale, AL?
In Irondale, the first 32°F freeze of fall lands around November 11 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Irondale in?
Irondale is in USDA hardiness zone 8a. In zone 8a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Irondale?
There are roughly 235 frost-free days in Irondale (a long growing season), running from the average last frost around March 21 to the first fall frost near November 11.
When should I plant tomatoes in Irondale?
In Irondale, start tomato seeds indoors around January 24–February 7, then transplant seedlings outdoors around March 28 once the danger of frost has passed.
Never miss a window in Irondale
An email when it’s time to start seeds, transplant, and sow — timed to Irondale’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Leeds · 8 km
- Mountain Brook · 9 km
- Vestavia Hills · 11 km
- Center Point · 12 km
- Birmingham · 13 km
- Trussville · 16 km
- Homewood · 17 km
- Moody · 17 km
Frost dates recorded at BIRMINGHAM AP, 8 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 Irondale, AL — Frost Dates & Zone 8a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00013876. Retrieved from https://blissgarden.com/alabama/irondale.