The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By looking at the USDA zone info for Coralville you should be able to figure out when it's possible to plant bee balm.

Planting Calendar for Bee Balm

Frost tolerance for bee balm:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant bee balm slightly earlier in the year because they are barely cold tolerant.

The earliest that you can plant bee balm in Coralville 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 bee balm and expect a good harvest is probably August. If you wait any later than that and your bee balm may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your bee balm indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Coralville. It might get as low as -15°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Coralville is just an average and the actual date of last frost is different every year. Since half of the time in Coralville you get a frost after April 15 be ready to cover your bee balm in the event of a late frost.

USDA Zone Info for Coralville

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Coralville

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