Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You should be able to figure out when to plant missouri primrose by referring to the USDA zone info for Elk River.

Planting Calendar for Missouri Primrose

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

You can plant missouri primrose a little earlier in the year because they do well in moderate cold.

The earliest that you can plant missouri primrose 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 missouri primrose and expect a good harvest is probably August. You probably don't want to wait any later than that or else your missouri primrose may not have a chance to really do well. Starting your missouri primrose indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer 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 not always accurate the actual date of last frost will vary from year to year. Since half of the time in Elk River it frosts late in the year after May 15 be ready to cover your missouri primrose if you have a 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.