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.

The USDA zone info for Coldwater can be looked at to figure out when you can plant calendula.

Planting Calendar for Calendula

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

Calendula do well in some cold which means that you can plant them just a bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant calendula in Coldwater is February. However, you really should wait until March if you don't want to take any chances.

The last month that you can plant calendula and expect a good harvest is probably September. Any later than that and your calendula may not have a chance to fully mature. You can get started a few weeks earlier by starting your calendula indoors.

Last Frost Date

The average date of last frost is April 15 in Coldwater. You should expect an average low temperature of -15°F in the coldest months of winter.

Since the USDA zone info for Coldwater is an average the actual date of last frost can change quite a bit from year to year. Half of the time in Coldwater it frosts late in the year after April 15 so make sure that you are prepared to protect your calendula if you have one of those late frosts.

USDA Zone Info for Coldwater

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 Coldwater

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