The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By checking out the USDA zone info for Thief River Falls it's a good idea to estimate when you can plant dallas fern.

Planting Calendar for Dallas Fern

Frost tolerance for dallas fern:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since dallas fern are not cold tolerant you have to wait until after the last frost before you can plant them.

The earliest that you can plant dallas fern in Thief River Falls is May. However, you really should wait until June if you don't want to take any chances.

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

Last Frost Date

The average date of last frost is May 15 in Thief River Falls. In the coldest months of winter you can expect an average low temperature of -35°F.

It's important to remember that the actual date of last frost may not be accurate from year to year because it is based on the USDA zone info for Thief River Falls and it will vary from year to year. Since half of the time in Thief River Falls last frost occurs after May 15 be ready to protect your dallas fern in the event of a late frost.

USDA Zone Info for Thief River Falls

Here is the info for USDA Zone 3b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-35°F
Highest Expected Low	-30°F

This means that on a really cold year, the coldest it will get is -35°F. On most years you should be prepared to experience lows near -30°F.

Plants to Grow in Thief River Falls

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