One of the first steps you take when you are figuring out 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.

It's possible to figure out when to plant stoneseed by referring to the USDA zone info for Havre.

Planting Calendar for Stoneseed

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

It's a bad idea to plant stoneseed until after the last frost has passed because they are not cold tolerant.

The earliest that you can plant stoneseed in Havre is May. However, you really should wait until June 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. If you wait any later than that and 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

The average date of last frost is May 15 in Havre. You should expect an average low temperature of -30°F in the coldest months of winter.

Always keep in mind that USDA zone info for Havre is an average and the actual date of last frost changes from year to year. Half of the time in Havre you get a frost after May 15 so just be sure to be ready to cover your stoneseed if you have a surprise late frost.

USDA Zone Info for Havre

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Havre

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