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

One way of getting a good idea when it's a good idea to plant four-o-clock flower is to look at the USDA zone info for Pontiac.

Planting Calendar for Four-o-clock flower

Frost tolerance for four-o-clock flower:	Not tolerant of frost.
When to plant:	After the last frost.

Since four-o-clock flower require warm weather you really should wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant four-o-clock flower in Pontiac 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 flower and expect a good harvest is probably August. You probably don't want to wait any later than that or else your four-o-clock flower may not have a chance to fully mature. If you are starting your four-o-clock flower indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Pontiac. It might get as low as -10°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Pontiac is an average and the actual date of last frost is different every year. Half of the time in Pontiac it frosts late in the year after April 15 so make sure that you are prepared to cover your four-o-clock flower if you have a late frost.

USDA Zone Info for Pontiac

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 Pontiac

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