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

By using the USDA zone info for Jacksonville Beach you should be able to figure out when to plant cosmos.

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 do ok in moderate cold which tells us that you can start planting them slightly earlier than more sensitive plants.

The earliest that you can plant cosmos in Jacksonville 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. You probably don't want to wait any later than that or else your cosmos may not have a chance to really do well. Starting your cosmos indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average the last frost has passed is on February 15 in Jacksonville Beach. It might get as low as 20°F during the coldest months of winter.

Remember that the actual date of last frost is an average because it is based on the USDA zone info for Jacksonville Beach and it is different every year. Half of the time in Jacksonville Beach there is a last frost after February 15 so make sure that you are prepared to cover your cosmos if you have a surprise late frost.

USDA Zone Info for Jacksonville Beach

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Jacksonville Beach

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