Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

It's a good idea to figure out when it's the best time to plant ageratum by referring to the USDA zone info for Liberty Lake.

Planting Calendar for Ageratum

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

Ageratum do not do well in cold weather which tells us that you must wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant ageratum in Liberty Lake 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 grow to maturity. You can get started a little bit earlier by starting your ageratum indoors.

Last Frost Date

The average date of last frost is April 15 in Liberty Lake. In the coldest months of winter you should expect an average low temperature of -5°F.

Since the USDA zone info for Liberty Lake is an average the actual date of last frost can change quite a bit from year to year. Since half of the time in Liberty Lake it frosts late in the year after April 15 be ready to cover your ageratum if you have one of those late frosts.

USDA Zone Info for Liberty Lake

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Liberty Lake

You may be interested in your other planting guides for Liberty Lake.