One of the first steps you take when you are estimating your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You should be able to determine when it's the best time to plant asters by reviewing the USDA zone info for Warrenton.

Planting Calendar for Asters

Frost tolerance for asters:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Asters are moderately cold tolerant which tells us that you can get them planted earlier than more sensitive plants.

The earliest that you can plant asters in Warrenton is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant asters and expect a good harvest is probably October. Any later than that and your asters may not have a chance to really do well. You can get started a couple of weeks earlier by starting your asters indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on February 15 in Warrenton. In the coldest months of winter you should expect an average low temperature of 20°F.

Since the USDA zone info for Warrenton may not be accurate from year to year the actual date of last frost is different every year. Half of the time in Warrenton you get surprised by a frost after February 15 so always be ready to protect your asters if you have a late frost.

USDA Zone Info for Warrenton

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Warrenton

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