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.

The USDA zone info for Iron Mountain can be reffered to in order to figure out when it's possible to plant argyranthemum.

Planting Calendar for Argyranthemum

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

You can not plant argyranthemum until after the last frost when the weather gets warmer because they are not cold tolerant.

The earliest that you can plant argyranthemum 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 argyranthemum and expect a good harvest is probably August. If you wait any later than that and your argyranthemum may not have a chance to fully mature. Starting your argyranthemum indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on May 15 in Iron Mountain. You can expect an average low temperature of -30°F in the coldest months of winter.

Always keep in mind that USDA zone info for Iron Mountain is an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Iron Mountain last frost occurs after May 15 so make sure that you are ready to cover your argyranthemum 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.