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 Rock Island should be reviewed to figure out when you can plant chrysanthemum.

Planting Calendar for Chrysanthemum

Frost tolerance for chrysanthemum:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Chrysanthemum do not do well in cold weather which means that you really should wait until it warms up after the last frost before you can plant them.

The earliest that you can plant chrysanthemum in Rock Island is April. However, you really should wait until May if you don't want to take any chances.

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

Last Frost Date

In Rock Island the average date of last frost happens on April 15. In the coldest months of winter you can expect an average low temperature of -15°F.

Since the USDA zone info for Rock Island is not always accurate the actual date of last frost will vary from year to year. Half of the time in Rock Island last frost occurs after April 15 so just be sure to be ready to cover your chrysanthemum in the event of a surprise late frost.

USDA Zone Info for Rock Island

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 Rock Island

You may be interested in your other planting guides for Rock Island.