One of the best tools that you have as gardeners to help us figure out your gardening schedule is the 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 a good idea to figure out when you can plant four o' clock by checking out the USDA zone info for Jacksonville.

Planting Calendar for Four O' Clock

Frost tolerance for four o' clock:	Not tolerant of frost.
When to plant:	After the last frost has passed.

It's a bad idea to plant four o' clock until after the last frost because they require warm weather.

The earliest that you can plant four o' clock in Jacksonville is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant four o' clock and expect a good harvest is probably August. Any later than that and your four o' clock may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your four o' clock indoors.

Last Frost Date

The average date of last frost is April 15 in Jacksonville. It might get as low as -10°F during the coldest months of winter.

It's important to remember that the actual date of last frost may not be accurate from year to year because it is based on the USDA zone info for Jacksonville and it can change quite a bit from year to year. Half of the time in Jacksonville it frosts late in the year after April 15 so always be ready to protect your four o' clock if you have one of those late frosts.

USDA Zone Info for Jacksonville

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Jacksonville

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