The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's a good idea to figure out when it's the best time to plant bishop's weed by referring to the USDA zone info for Elk River.

Planting Calendar for Bishop's Weed

Frost tolerance for bishop's weed:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since bishop's weed are one of those plants that can tolerate quite a bit of cold weather 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 bishop's weed 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 bishop's weed and expect a good harvest is probably August. You probably don't want to wait any later than that or else your bishop's weed may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your bishop's weed indoors.

Last Frost Date

The average date of last frost is May 15 in Elk River. It might get as low as -25°F during the coldest months of winter.

Since the USDA zone info for Elk River is not always accurate the actual date of last frost will vary from year to year. Since half of the time in Elk River last frost occurs after May 15 be ready to cover your bishop's weed if you have 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.