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.

It's possible to figure out when it's the best time to plant cosmos by using the USDA zone info for West Palm Beach.

Planting Calendar for Cosmos

Frost tolerance for cosmos:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Cosmos can survive in some cold which means that you can plant them just a tiny bit earlier in the year than other frost tender plants.

The earliest that you can plant cosmos in West Palm Beach is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant cosmos and expect a good harvest is probably September. Any later than that and your cosmos may not have a chance to really do well. Starting your cosmos indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost is on January 31 in West Palm Beach. In the coldest months of winter you can expect an average low temperature of 35°F.

It's important to remember that USDA zone info for West Palm Beach is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in West Palm Beach you get a frost after January 31 so be sure to be ready to protect your cosmos in the event of a late frost.

USDA Zone Info for West Palm Beach

Here is the info for USDA Zone 10b.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	35°F
Highest Expected Low	40°F

This means that on a really cold year, the coldest it will get is 35°F. On most years you should be prepared to experience lows near 40°F.

Plants to Grow in West Palm Beach

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