One of the first steps you take when you are estimating 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.

The USDA zone info for Honolulu can be reffered to in order to estimate when it's a good idea to plant portulaca.

Planting Calendar for Portulaca

Frost tolerance for portulaca:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Portulaca do not do well in cold weather which tells us that it is important to wait until it warms up after the last frost before you can plant them.

The earliest that you can plant portulaca 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 portulaca and expect a good harvest is probably November. You probably don't want to wait any later than that or else your portulaca may not have a chance to fully mature. If you are starting your portulaca indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

In Honolulu it never frosts. In the coldest months of winter you can expect an average low temperature of 50°F.

Remember that USDA zone info for Honolulu is not always accurate and the actual date of last frost can change quite a bit from year to year. Since it never frosts in Honolulu you do not have to be ready to cover your portulaca in the event of a late frost.

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.