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 Havre you can determine when it's a good idea to plant mimulus by referring to the USDA zone info.

Planting Calendar for Mimulus

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

Since mimulus are not cold tolerant you need to wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant mimulus 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 mimulus and expect a good harvest is probably August. Any later than that and your mimulus may not have a chance to fully mature. If you are starting your mimulus indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

In Havre the average date of last frost happens on May 15. You can expect an average low temperature of -30°F in the coldest months of winter.

Remember that USDA zone info for Havre is an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Havre there is a last frost after May 15 so make sure that you are prepared to cover your mimulus in the event of 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.