One of the first steps you take when you are determining 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.

You can estimate when it's a good idea to plant lisianthus in Platteville by reviewing the USDA zone info.

Planting Calendar for Lisianthus

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

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

The earliest that you can plant lisianthus in Platteville 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. Any later than that and your lisianthus may not have a chance to really do well. You can get started a little bit earlier by starting your lisianthus indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Platteville. You should expect an average low temperature of -20°F in the coldest months of winter.

Since the USDA zone info for Platteville is just an average the actual date of last frost can change quite a bit from year to year. Half of the time in Platteville there is a last frost after April 15 so be sure to be ready to cover your lisianthus if you have a surprise late frost.

USDA Zone Info for Platteville

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Platteville

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