The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By using the USDA zone info for Hillsboro it's a good idea to figure out when it's the best time to plant hardy asters.

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.

Hardy Asters do well in very little cold which tells us that you can plant them slightly earlier in the year than more sensitive plants.

The earliest that you can plant hardy asters in Hillsboro is March. However, you really should wait until April 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 August. Any later than that and your hardy asters may not have a chance to really do well. You can get started a few weeks earlier by starting your hardy asters indoors.

Last Frost Date

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

Always keep in mind that USDA zone info for Hillsboro may not be accurate from year to year and the actual date of last frost can change quite a bit from year to year. Since half of the time in Hillsboro you get a frost after April 15 be ready to protect your hardy asters in the event of one of those late frosts.

USDA Zone Info for Hillsboro

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 Hillsboro

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