One of the best tools that you have as gardeners to help us figure out your gardening schedule is the 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 Isanti should be reffered to in order to determine when it's a good idea to plant doronicum.

Planting Calendar for Doronicum

Frost tolerance for doronicum:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Doronicum do well in some cold which means that you can plant them a little bit earlier in the year than other frost tender plants.

The earliest that you can plant doronicum in Isanti 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 doronicum and expect a good harvest is probably August. Any later than that and your doronicum may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your doronicum indoors.

Last Frost Date

The average date of last frost is May 15 in Isanti. In the coldest months of winter you should expect an average low temperature of -30°F.

Since the USDA zone info for Isanti may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Isanti it frosts late in the year after May 15 so make sure that you are ready to cover your doronicum if you have one of those late frosts.

USDA Zone Info for Isanti

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 Isanti

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