One of the first steps you take when you are figuring out your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A way of making a decision about when to plant fennel is to refer to the USDA zone info for Honolulu.

Planting Calendar for Fennel

Frost tolerance for fennel:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Fennel are very cold tolerant which tells us that you can plant them a quite a bit earlier than more sensitive plants.

The earliest that you can plant fennel in Honolulu is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant fennel and expect a good harvest is probably November. Any later than that and your fennel may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your fennel indoors.

Last Frost Date

In Honolulu it never frosts. It might get as low as 50°F during the coldest months of winter.

Keep in mind that USDA zone info for Honolulu may not be accurate from year to year and the actual date of last frost is different every year. Since it never frosts in Honolulu you do not have to be ready to cover your fennel if you have one of those late frosts.

USDA Zone Info for Honolulu

Here is the info for USDA Zone 12a.

Average Date of Last Frost (spring)	Never
Average Date of First Frost (fall)	Never
Lowest Expected Low	50°F
Highest Expected Low	55°F

This means that on a really cold year, the coldest it will get is 50°F. On most years you should be prepared to experience lows near 55°F.

Plants to Grow in Honolulu

You may be interested in your other planting guides for Honolulu.