One of the best tools that you have as gardeners to help us determine 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 determine when you can plant impatiens by looking at the USDA zone info for Bonne Terre.

Planting Calendar for Impatiens

Frost tolerance for impatiens:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

You can not plant impatiens until after the last frost because they do not do well in cold weather.

The earliest that you can plant impatiens in Bonne Terre 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 impatiens and expect a good harvest is probably August. Any later than that and your impatiens may not have a chance to really do well. You can get started a little bit earlier by starting your impatiens indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Bonne Terre. You can expect an average low temperature of -10°F in the coldest months of winter.

It's important to remember that USDA zone info for Bonne Terre is just an average and the actual date of last frost changes from year to year. Half of the time in Bonne Terre last frost occurs after April 15 so make sure that you are ready to protect your impatiens in the event of one of those late frosts.

USDA Zone Info for Bonne Terre

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 Bonne Terre

You may be interested in your other planting guides for Bonne Terre.