One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for International Falls should be read to estimate when you can plant aubretia.

Planting Calendar for Aubretia

Frost tolerance for aubretia:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Aubretia can survive in pretty solid cold which means that you can plant them much earlier in the year than other plants that might not handle the cold.

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

Last Frost Date

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

Keep in mind that USDA zone info for International Falls is not always accurate and the actual date of last frost can change quite a bit from year to year. Since half of the time in International Falls you get surprised by a frost after May 15 be ready to protect your aubretia if you have a surprise late frost.

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.