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

In International Falls you can estimate when to plant sutera by referring to the USDA zone info.

Planting Calendar for Sutera

Frost tolerance for sutera:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

Sutera tend to make it in a tiny bit of cold which tells us that you can plant them slightly earlier in the year than more sensitive plants.

The earliest that you can plant sutera in International Falls 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 sutera and expect a good harvest is probably August. If you wait any later than that and your sutera may not have a chance to fully mature. You can get started a few weeks earlier by starting your sutera indoors.

Last Frost Date

On average the last frost is on May 15 in International Falls. In the coldest months of winter you can expect an average low temperature of -40°F.

Since the USDA zone info for International Falls may not be accurate from year to year the actual date of last frost is different every year. Half of the time in International Falls you get a frost after May 15 so always be ready to protect your sutera if you have one of those late frosts.

USDA Zone Info for International Falls

Here is the info for USDA Zone 3a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-40°F
Highest Expected Low	-35°F

This means that on a really cold year, the coldest it will get is -40°F. On most years you should be prepared to experience lows near -35°F.

Plants to Grow in International Falls

You may be interested in your other planting guides for International Falls.