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.

You will be able to determine when it's a good idea to plant sweet williams by referring to the USDA zone info for Key Biscayne.

Planting Calendar for Sweet Williams

Frost tolerance for sweet williams:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Sweet Williams can survive in a little bit of cold which tells us that you can plant them a bit earlier in the year than other plants that might not handle the cold.

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

Last Frost Date

In Key Biscayne it never frosts. You can expect an average low temperature of 40°F in the coldest months of winter.

Since the USDA zone info for Key Biscayne is not always accurate the actual date of last frost will vary from year to year. Since it never frosts in Key Biscayne you do not have to be ready to cover your sweet williams if you have one of those late frosts.

USDA Zone Info for Key Biscayne

Here is the info for USDA Zone 11a.

Average Date of Last Frost (spring)	Never
Average Date of First Frost (fall)	Never
Lowest Expected Low	40°F
Highest Expected Low	45°F

This means that on a really cold year, the coldest it will get is 40°F. On most years you should be prepared to experience lows near 45°F.

Plants to Grow in Key Biscayne

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