The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By looking at the USDA zone info for Havre it's a good idea to determine when you can plant morning glory.

Planting Calendar for Morning Glory

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

Since morning glory are not cold tolerant it's necessary to wait until after the last frost has passed before you can plant them.

The earliest that you can plant morning glory 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 morning glory and expect a good harvest is probably August. If you wait any later than that and your morning glory may not have a chance to fully mature. You can get started a little bit earlier by starting your morning glory indoors.

Last Frost Date

On average all chance of frost has passed is on May 15 in Havre. In the coldest months of winter you should expect an average low temperature of -30°F.

Remember that USDA zone info for Havre is not always accurate and the actual date of last frost changes from year to year. Since half of the time in Havre last frost occurs after May 15 be ready to protect your morning glory 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.