Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Bonne Terre you can determine when it's a good idea to plant violas by checking out the USDA zone info.

Planting Calendar for Violas

Frost tolerance for violas:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since violas are one of those plants that can tolerate quite a bit of cold weather you can plant them earlier in the year than other plants that might not handle the cold.

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

Last Frost Date

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

Since the USDA zone info for Bonne Terre may not be accurate from year to year 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 always be ready to cover your violas if you have a late frost.

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.