One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A way of estimating when it's a good idea to plant stoneseed is to look at the USDA zone info for Missoula.

Planting Calendar for Stoneseed

Frost tolerance for stoneseed:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Stoneseed do not do well in cold weather which tells us that it's important to wait until it warms up after the last frost when the weather gets warmer before you can plant them.

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

Last Frost Date

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

Always keep in mind that USDA zone info for Missoula may not be accurate from year to year and the actual date of last frost changes from year to year. Since half of the time in Missoula it frosts late in the year after April 15 be ready to cover your stoneseed if you have a late frost.

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.