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.

The USDA zone info for Elk River should be used to determine when it's a good idea to plant aurinia.

Planting Calendar for Aurinia

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

Since aurinia do well in cold you can plant them a lot earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant aurinia in Elk River 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 aurinia and expect a good harvest is probably August. You probably don't want to wait any later than that or else your aurinia may not have a chance to grow to maturity. If you are starting your aurinia indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average the last frost has passed is on May 15 in Elk River. You can expect an average low temperature of -25°F in the coldest months of winter.

Since the USDA zone info for Elk River is an average the actual date of last frost will vary from year to year. Half of the time in Elk River you get a frost after May 15 so always be ready to cover your aurinia in the event of a surprise late frost.

USDA Zone Info for Elk River

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Elk River

You may be interested in your other planting guides for Elk River.