One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The best time to plant ageratum in Payette should be figured out by reviewing the USDA zone info.

Planting Calendar for Ageratum

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

It's probably a bad idea to plant ageratum until after the last frost because they do not do well in cold weather.

The earliest that you can plant ageratum in Payette 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. Any later than that and your ageratum may not have a chance to fully mature. You can get started a few weeks earlier by starting your ageratum indoors.

Last Frost Date

The average date of last frost is April 15 in Payette. It might get as low as -5°F during the coldest months of winter.

Since the USDA zone info for Payette is not always accurate the actual date of last frost is different every year. Since half of the time in Payette you get surprised by a frost after April 15 be ready to protect your ageratum in the event of a surprise late frost.

USDA Zone Info for Payette

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 Payette

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