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.

The USDA zone info for Missoula should be reffered to in order to figure out when to plant torenia.

Planting Calendar for Torenia

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

It's probably not a good idea to plant torenia until after the last frost because they require warm weather.

The earliest that you can plant torenia in Missoula 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 torenia and expect a good harvest is probably August. Any later than that and your torenia may not have a chance to really do well. You can get started a little bit earlier by starting your torenia indoors.

Last Frost Date

On average the last frost is on April 15 in Missoula. In the coldest months of winter you should expect an average low temperature of -15°F.

It's important to remember that USDA zone info for Missoula is not always accurate and the actual date of last frost changes from year to year. Half of the time in Missoula there is a last frost after April 15 so always be ready to cover your torenia if you have one of those late frosts.

USDA Zone Info for Missoula

Here is the info for USDA Zone 5b.

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

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Missoula

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