One of the first steps you take when you are determining your gardening schedule is find your 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.

You can figure out when you can plant lupine in Grand Forks by using the USDA zone info.

Planting Calendar for Lupine

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

Lupine do ok in a little bit of cold which means that you can plant them a little earlier in the year than other plants that might not handle the cold.

The earliest that you can plant lupine in Grand Forks 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 lupine and expect a good harvest is probably August. Any later than that and your lupine may not have a chance to really do well. Starting your lupine indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on May 15 in Grand Forks. In the coldest months of winter you should expect an average low temperature of -30°F.

Always keep in mind that USDA zone info for Grand Forks is an average and the actual date of last frost will vary from year to year. Half of the time in Grand Forks you get a frost after May 15 so be sure to be ready to cover your lupine if you have a late frost.

USDA Zone Info for Grand Forks

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Grand Forks

You may be interested in your other planting guides for Grand Forks.