One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By using the USDA zone info for River Falls it's a good idea to figure out when you can plant flax.

Planting Calendar for Flax

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

You can plant flax a bit earlier in the year because they are one of those plants that can tolerate a little bit of cold weather.

The earliest that you can plant flax in River 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 flax and expect a good harvest is probably August. You probably don't want to wait any later than that or else your flax may not have a chance to grow to maturity. Starting your flax indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is May 15 in River Falls. You should expect an average low temperature of -25°F in the coldest months of winter.

Since the USDA zone info for River Falls is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in River Falls last frost occurs after May 15 so just be sure to be ready to cover your flax in the event of a surprise late frost.

USDA Zone Info for River Falls

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 River Falls

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