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 Robbins you can determine when it's a good idea to plant ageratum by looking at the USDA zone info.

Planting Calendar for Ageratum

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

You should not plant ageratum until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant ageratum in Robbins 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 ageratum and expect a good harvest is probably August. If you wait any later than that and your ageratum may not have a chance to really do well. You can get started a couple of weeks earlier by starting your ageratum indoors.

Last Frost Date

The average date of last frost is April 15 in Robbins. You should expect an average low temperature of -10°F in the coldest months of winter.

Since the USDA zone info for Robbins may not be accurate from year to year the actual date of last frost changes from year to year. Since half of the time in Robbins there is a last frost after April 15 be ready to protect your ageratum in the event of one of those late frosts.

USDA Zone Info for Robbins

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Robbins

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