One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The first opportunity to plant asters in Roselle should be estimated by referring to the USDA zone info.

Planting Calendar for Asters

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

You can plant asters a little earlier in the year because they do well in moderate cold.

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

The last month that you can plant asters and expect a good harvest is probably September. If you wait any later than that and your asters may not have a chance to grow to maturity. If you are starting your asters indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

On average all chance of frost has passed is on April 15 in Roselle. In the coldest months of winter you should expect an average low temperature of 0°F.

It's important to remember that USDA zone info for Roselle is just an average and the actual date of last frost changes from year to year. Half of the time in Roselle it frosts late in the year after April 15 so make sure that you are ready to protect your asters if you have a surprise late frost.

USDA Zone Info for Roselle

Here is the info for USDA Zone 7a.

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

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

Plants to Grow in Roselle

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