Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A common way of making a decision about when it's the best time to plant hardy asters is to consult the USDA zone info for Zone 1b.

Planting Calendar for Hardy Asters

Frost tolerance for hardy asters:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant hardy asters just a tiny bit earlier in the year because they are barely cold tolerant.

The earliest that you can plant hardy asters in Zone 1b is June. However, you really should wait until July if you don't want to take any chances.

The last month that you can plant hardy asters and expect a good harvest is probably July. If you wait any later than that and your hardy asters may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your hardy asters indoors.

Last Frost Date

On average the last frost is on June 15 in Zone 1b. You should expect an average low temperature of -55°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Zone 1b is just an average and the actual date of last frost changes from year to year. Since half of the time in Zone 1b it frosts late in the year after June 15 be ready to protect your hardy asters in the event of one of those late frosts.

USDA Zone Info for Zone 1b

Here is the info for USDA Zone 1b.

Average Date of Last Frost (spring)	June 15
Average Date of First Frost (fall)	July 15
Lowest Expected Low	-55°F
Highest Expected Low	-50°F

This means that on a really cold year, the coldest it will get is -55°F. On most years you should be prepared to experience lows near -50°F.

Plants to Grow in Zone 1b

You may be interested in your other planting guides for Zone 1b.