One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Detroit Lakes you can estimate when it's the best time to plant pentas by using the USDA zone info.

Planting Calendar for Pentas

Frost tolerance for pentas:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

You can not plant pentas until after all chance of frost has passed because they are not cold tolerant.

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

Last Frost Date

In Detroit Lakes the average date of last frost happens on May 15. In the coldest months of winter you can expect an average low temperature of -35°F.

Keep in mind that USDA zone info for Detroit Lakes is just an average and the actual date of last frost is different every year. Since half of the time in Detroit Lakes it frosts late in the year after May 15 be ready to protect your pentas if you have a surprise late frost.

USDA Zone Info for Detroit Lakes

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 Detroit Lakes

You may be interested in your other planting guides for Detroit Lakes.