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.

You can estimate when it's a good idea to plant roses in Havre by looking at the USDA zone info.

Planting Calendar for Roses

Frost tolerance for roses:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since roses are one of those plants that can tolerate a little bit of cold weather you can plant them a little earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant roses in Havre is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant roses and expect a good harvest is probably August. If you wait any later than that and your roses may not have a chance to grow to maturity. Starting your roses indoors is a great way to get them started a few weeks earlier.

Last Frost Date

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

Just be sure to remember that USDA zone info for Havre may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Havre you get a frost after May 15 so make sure that you are prepared to protect your roses 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.