The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The earliest that you can plant periwinkles in Key West can be estimated by checking out the USDA zone info.

Planting Calendar for Periwinkles

Frost tolerance for periwinkles:	Not tolerant of frost.
When to plant:	After the last frost.

Since periwinkles require warm weather you really should wait until after the last frost has passed before you can plant them.

The earliest that you can plant periwinkles in Key West 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 periwinkles and expect a good harvest is probably November. If you wait any later than that and your periwinkles may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your periwinkles indoors.

Last Frost Date

In Key West it never frosts. You should expect an average low temperature of 45°F in the coldest months of winter.

Remember that the actual date of last frost is just an average because it is based on the USDA zone info for Key West and it will vary from year to year. Since it never frosts in Key West you do not have to be ready to protect your periwinkles if you have one of those late frosts.

USDA Zone Info for Key West

Here is the info for USDA Zone 11b.

Average Date of Last Frost (spring)	Never
Average Date of First Frost (fall)	Never
Lowest Expected Low	45°F
Highest Expected Low	50°F

This means that on a really cold year, the coldest it will get is 45°F. On most years you should be prepared to experience lows near 50°F.

Plants to Grow in Key West

You may be interested in your other planting guides for Key West.