One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The best time to plant blue throatwort in Madison can be determined by referring to the USDA zone info.

Planting Calendar for Blue Throatwort

Frost tolerance for blue throatwort:	Not tolerant of frost.
When to plant:	After the last frost.

Since blue throatwort require warm weather you need to wait until after the last frost before you can plant them.

The earliest that you can plant blue throatwort in Madison 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 blue throatwort and expect a good harvest is probably August. If you wait any later than that and your blue throatwort may not have a chance to fully mature. You can get started a little bit earlier by starting your blue throatwort indoors.

Last Frost Date

In Madison the average date of last frost happens on April 15. You should expect an average low temperature of 5°F in the coldest months of winter.

It's important to remember that USDA zone info for Madison is an average and the actual date of last frost changes from year to year. Since half of the time in Madison there is a last frost after April 15 be ready to protect your blue throatwort if you have a surprise late frost.

USDA Zone Info for Madison

Here is the info for USDA Zone 7b.

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

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

Plants to Grow in Madison

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