One of the best tools that you have as gardeners to help us figure out your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In International Falls you can figure out when it's the best time to plant leeks by referring to the USDA zone info.

Planting Calendar for Leeks

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

You can plant leeks earlier in the year because they are very cold tolerant.

The earliest that you can plant leeks 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 leeks and expect a good harvest is probably August. Any later than that and your leeks may not have a chance to grow to maturity. Starting your leeks indoors is a great way to get them started a little bit earlier.

Last Frost Date

In International Falls the average date of last frost happens on May 15. You should expect an average low temperature of -40°F in the coldest months of winter.

Since the USDA zone info for International Falls is not always accurate the actual date of last frost will vary from year to year. Since half of the time in International Falls there is a last frost after May 15 be ready to cover your leeks in the event of a late frost.

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.