Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You should be able to estimate when to plant gayfeather by using the USDA zone info for International Falls.

Planting Calendar for Gayfeather

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

You can plant gayfeather quite a bit earlier in the year because they do well in cold.

The earliest that you can plant gayfeather in International 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 gayfeather and expect a good harvest is probably August. Any later than that and your gayfeather may not have a chance to really do well. Starting your gayfeather 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 International Falls. You should expect an average low temperature of -40°F in the coldest months of winter.

Keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for International Falls and it is different every year. Half of the time in International Falls last frost occurs after May 15 so always be ready to protect your gayfeather in the event of one of those late frosts.

USDA Zone Info for International Falls

Here is the info for USDA Zone 3a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-40°F
Highest Expected Low	-35°F

This means that on a really cold year, the coldest it will get is -40°F. On most years you should be prepared to experience lows near -35°F.

Plants to Grow in International Falls

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