One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By checking out the USDA zone info for Thief River Falls it's possible to figure out when to plant pincushion flower.

Planting Calendar for Pincushion Flower

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

Pincushion Flower do well in mild cold which means that you can plant them a little bit earlier in the year than other plants that might not handle the cold.

The earliest that you can plant pincushion flower in Thief 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 pincushion flower and expect a good harvest is probably August. Any later than that and your pincushion flower may not have a chance to fully mature. If you are starting your pincushion flower indoors then you might be able to get away with starting them 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.

Keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for Thief River Falls and it changes from year to year. Half of the time in Thief River Falls it frosts late in the year after May 15 so be sure to be ready to protect your pincushion flower if you have a surprise 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.