The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You should be able to estimate when it's the best time to plant firebush by using the USDA zone info for Iron Mountain.

Planting Calendar for Firebush

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

Firebush require warm weather which tells us that you really should wait until it warms up after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant firebush in Iron Mountain 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 firebush and expect a good harvest is probably August. You probably don't want to wait any later than that or else your firebush may not have a chance to fully mature. If you are starting your firebush indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

In Iron Mountain the average date of last frost happens on May 15. It might get as low as -30°F during the coldest months of winter.

Since the USDA zone info for Iron Mountain 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 Iron Mountain it frosts late in the year after May 15 be ready to cover your firebush in the event of one of those late frosts.

USDA Zone Info for Iron Mountain

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 Iron Mountain

You may be interested in your other planting guides for Iron Mountain.