Last frost date in Flagstaff, Arizona
June 4
Average last frost in spring. In an early year (1 in 10) it's over by May 21; in a late year (1 in 10) it comes after June 19.
September 28
Average first frost in fall. 1 year in 10 it comes by September 16.
Source: NOAA U.S. Climate Normals 1991–2020, station Flagstaff Pulliam AP (USW00003103), 3.8 miles from Flagstaff, elevation 7,003 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | May 21 | June 4 | June 19 |
| First frost in fall | Sept 16 | Sept 28 | Oct 9 |
An early or late year is one in 10: 1 year in 10 the frost comes before the early date, and 1 year in 10 after the late date.
Frost-free days in an average year: 115
Planting calendar for Flagstaff
Fall planting
USDA dates for places whose average first freeze is about September 30 (Flagstaff: September 28).
- PotatoesMay 1 – June 15 (past for this year)
- Cauliflower plantsMay 10 – July 15 (past for this year)
- Cantaloupe (muskmelon)May 15 – June 1 (past for this year)
- New Zealand spinachMay 15 – July 1 (past for this year)
- WatermelonMay 15 – June 1 (past for this year)
- Eggplant plantsMay 20 – June 10 (past for this year)
- SoybeansMay 25 – June 10 (past for this year)
- BeetsJune 1 – July 10 (past for this year)
- Broccoli plantsJune 1 – 30 (past for this year)
- Brussels sprouts plantsJune 1 – 30 (past for this year)
- Cabbage plantsJune 1 – July 10 (past for this year)
- CarrotsJune 1 – July 10 (past for this year)
- Celery and celeriac plantsJune 1 – July 5 (past for this year)
- Chinese cabbageJune 1 – July 15 (past for this year)
- CucumbersJune 1 – July 1 (past for this year)
- DandelionJune 1 – Aug 1 (past for this year)
- Florence fennelJune 1 – July 1 (past for this year)
- Garden peasJune 1 – Aug 1 (past for this year)
- Leaf lettuceJune 1 – Aug 1 (past for this year)
- Lima beansJune 1 – 15 (past for this year)
- OkraJune 1 – July 1 (past for this year)
- ParsleyJune 1 – July 15 (past for this year)
- ParsnipsJune 1 – July 1 (past for this year)
- Peppers plantsJune 1 – July 1 (past for this year)
- RutabagaJune 1 – July 1 (past for this year)
- SalsifyJune 1 – 20 (past for this year)
- Snap beansJune 1 – July 10 (past for this year)
- SorrelJune 1 – July 15 (past for this year)
- Summer squashJune 1 – July 1 (past for this year)
- Sweet cornJune 1 – July 1 (past for this year)
- Swiss chardJune 1 – July 5 (past for this year)
- TomatoesJune 1 – 20 (past for this year)
- TurnipsJune 1 – Aug 1 (past for this year)
- Winter squashJune 1 – 15 (past for this year)
- Witloof chicoryJune 1 – July 1 (past for this year)
- Collards plantsJune 15 – July 15 (past for this year)
- EndiveJune 15 – Aug 1 (past for this year)
- Head lettuce plantsJune 15 – Aug 1 (past for this year)
- KaleJune 15 – July 15 (past for this year)
- KohlrabiJune 15 – July 15 (past for this year)
- Mustard greensJune 15 – Aug 1 (past for this year)
- RadishesJuly 1 – Sept 1 (past for this year)
- SpinachJuly 1 – Aug 15 (past for this year)
- Corn saladJuly 15 – Sept 1 (past for this year)
- Upland cressJuly 15 – Sept 1 (past for this year)
- Rhubarb plantsOct 1 – Nov 1Now
USDA lists chervil and chives, garlic, horseradish, leeks, onion plants, onion seed, onion sets, shallots as generally spring-planted here.
Spring planting
USDA dates for places whose average last freeze is about May 30 (Flagstaff: June 4).
- SpinachApr 20 – June 15
- Asparagus plantsMay 1 – June 1
- BeetsMay 1 – June 15
- Chervil and chivesMay 1 – June 1
- Corn saladMay 1 – June 15
- DandelionMay 1 – 30
- EndiveMay 1 – 30
- Florence fennelMay 1 – 30
- Garden peasMay 1 – June 15
- GarlicMay 1 – 30
- Horseradish plantsMay 1 – 30
- KaleMay 1 – 30
- KohlrabiMay 1 – 30
- LeeksMay 1 – 15
- Onion plants plantsMay 1 – 30
- Onion seedMay 1 – 30
- Onion setsMay 1 – 30
- PotatoesMay 1 – June 15
- RadishesMay 1 – June 15
- Rhubarb plantsMay 1 – 20
- ShallotsMay 1 – June 1
- TurnipsMay 1 – June 15
- Broccoli plantsMay 10 – June 10
- Brussels sprouts plantsMay 10 – June 10
- Cabbage plantsMay 10 – June 15
- CarrotsMay 10 – June 1
- Chinese cabbageMay 10 – June 15
- Collards plantsMay 10 – June 1
- Head lettuce plantsMay 10 – June 30
- Leaf lettuceMay 10 – June 30
- Mustard greensMay 10 – June 30
- ParsleyMay 10 – June 1
- ParsnipsMay 10 – June 1
- RutabagaMay 10 – 20
- SalsifyMay 10 – June 1
- SorrelMay 10 – June 10
- Upland cressMay 15 – June 1
- Cauliflower plantsMay 20 – June 1
- Celery and celeriac plantsMay 20 – June 1
- Sweet cornMay 20 – June 1
- Swiss chardMay 20 – June 1
- Snap beansMay 25 – June 15
- New Zealand spinachJune 1 – 15
- Peppers plantsJune 1 – 15
- Summer squashJune 1 – 20
- Witloof chicoryJune 1 – 15
- TomatoesJune 5 – 20
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5 (earliest safe spring and latest safe fall dates), applied to this place's NOAA frost dates. “Plants” means setting out transplants, not sowing seed. How we match the table.
Nearby in Arizona
- Cottonwood 36 mi · last frost Mar 30
- Camp Verde 45 mi · last frost Apr 16
- Chino Valley 54 mi · last frost Apr 27
- Prescott Valley 57 mi · last frost Apr 30
- Prescott 62 mi · last frost Apr 30