The USDA Zone info is a great tool for gardeners to help us estimate 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.

In Ottumwa you can figure out when it's possible to plant chrysanthemum by using the USDA zone info.

Planting Calendar for Chrysanthemum

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

Since chrysanthemum are not cold tolerant you really should wait until after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant chrysanthemum in Ottumwa 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. Any later than that and your chrysanthemum may not have a chance to fully mature. Starting your chrysanthemum indoors is a great way to get them started a little bit earlier.

Last Frost Date

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

Remember that USDA zone info for Ottumwa may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Ottumwa you get surprised by a frost after April 15 so just be sure to be ready to protect your chrysanthemum in the event of a late frost.

USDA Zone Info for Ottumwa

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 Ottumwa

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