Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Madison you can figure out when it's the best time to plant lisianthus by reviewing the USDA zone info.

Planting Calendar for Lisianthus

Frost tolerance for lisianthus:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since lisianthus do not do well in cold weather it is necessary to wait until after the last frost has passed before you can plant them.

The earliest that you can plant lisianthus 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 lisianthus and expect a good harvest is probably August. If you wait any later than that and your lisianthus may not have a chance to grow to maturity. Starting your lisianthus indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Madison. In the coldest months of winter you should expect an average low temperature of -5°F.

Since the USDA zone info for Madison is an average the actual date of last frost will vary from year to year. Since half of the time in Madison you get a frost after April 15 be ready to cover your lisianthus in the event of one of those late frosts.

USDA Zone Info for Madison

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°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 0°F.

Plants to Grow in Madison

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