One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

A common way of figuring out when it's possible to plant bittercress is to refer to the USDA zone info for Bonne Terre.

Planting Calendar for Bittercress

Frost tolerance for bittercress:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Bittercress are barely cold tolerant which tells us that you can start planting them slightly earlier than other frost tender plants.

The earliest that you can plant bittercress in Bonne Terre is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant bittercress and expect a good harvest is probably August. You probably don't want to wait any later than that or else your bittercress may not have a chance to grow to maturity. You can get started a little bit earlier by starting your bittercress indoors.

Last Frost Date

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

Just be sure to remember that USDA zone info for Bonne Terre may not be accurate from year to year and the actual date of last frost is different every year. Half of the time in Bonne Terre last frost occurs after April 15 so be sure to be ready to protect your bittercress 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.