Before planting it is a good idea to find your USDA Zone info to estimate 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.

A common way of determining when you can plant iresene is to consult the USDA zone info for Duluth.

Planting Calendar for Iresene

Frost tolerance for iresene:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Iresene require warm weather which means that it's important to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant iresene in Duluth is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant iresene and expect a good harvest is probably August. If you wait any later than that and your iresene may not have a chance to really do well. You can get started a few weeks earlier by starting your iresene indoors.

Last Frost Date

On average the last frost is on May 15 in Duluth. You should expect an average low temperature of -30°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Duluth is just an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Duluth it frosts late in the year after May 15 be ready to cover your iresene if you have a surprise late frost.

USDA Zone Info for Duluth

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 Duluth

You may be interested in your other planting guides for Duluth.