Zone 9 · Zone 9
First frost countdown
Around ~Dec 20
Zone 9's average first fall frost lands around ~Dec 20. That is a long-run average — a hard night can arrive a week or two early, so once you are inside three weeks, start watching the local forecast rather than the calendar.
Harvest these before the frost
These crops are still being picked in December in Zone 9, and a hard freeze ends them. Bring in what is ready and cover anything you want to push another week or two.
- BeetsPick now
Harvested December
- BroccoliPick now
Harvested January, February, March, October, November, December
- CarrotsPick now
Harvested January, February, December
- CauliflowerPick now
Harvested January, February, November
- GrapesPick now
Harvested December
- LemonsPick now
Harvested January, November
- LettucePick now
Harvested February, March, October, December
- OrangesPick now
Harvested January, November, December
- PeasPick now
Harvested February, March, April, July, December
Leave these — frost makes them sweeter
Cold converts stored starch into sugar, so these improve after a freeze rather than suffering from one. Pulling them early is the mistake.
- Brussels SproutsLeave it
Harvested November
- KaleLeave it
Harvested January, November, December
- LeeksLeave it
Harvested November
Common questions
- When is the first frost in Zone 9?
- Zone 9's average first fall frost falls around ~Dec 20. It is an average, not a guarantee — a cold snap can arrive one to two weeks early, so treat the countdown as a planning tool and watch your local forecast once you are inside three weeks.
- Which vegetables actually taste better after a frost?
- In Zone 9: Brussels Sprouts, Kale, Leeks. Cold converts stored starches into sugars, so these get sweeter rather than being damaged. Leave them in the ground and pick as needed.
Other zones: Zone 1 · Zone 2 · Zone 3 · Zone 4 · Zone 5 · Zone 6 · Zone 7 · Zone 8 · Zone 9 · Zone 10 · Zone 11 · Zone 12 · Zone 13