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.

In Grand Forks you can estimate when you can plant daylily by using the USDA zone info.

Planting Calendar for Daylily

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

Daylily can survive in moderate 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 daylily 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 daylily and expect a good harvest is probably August. Any later than that and your daylily may not have a chance to fully mature. You can get started a little bit earlier by starting your daylily indoors.

Last Frost Date

On average all chance of frost has passed is on May 15 in Grand Forks. In the coldest months of winter you can expect an average low temperature of -30°F.

Since the USDA zone info for Grand Forks may not be accurate from year to year the actual date of last frost will vary from year to year. Since half of the time in Grand Forks it frosts late in the year after May 15 be ready to cover your daylily if you have a surprise 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.