Before planting it is a good idea to find your USDA Zone info to determine 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.

One way of figuring out when it's a good idea to plant asparagus is to refer to the USDA zone info for Romeoville.

Planting Calendar for Asparagus

Frost tolerance for asparagus:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since asparagus do well in cold you can plant them earlier in the year than other frost tender plants.

The earliest that you can plant asparagus in Romeoville 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 asparagus and expect a good harvest is probably September. If you wait any later than that and your asparagus may not have a chance to really do well. You can get started a little bit earlier by starting your asparagus indoors.

Last Frost Date

The average date of last frost is April 15 in Romeoville. In the coldest months of winter you should expect an average low temperature of -15°F.

Since the USDA zone info for Romeoville may not be accurate from year to year the actual date of last frost is different every year. Half of the time in Romeoville it frosts late in the year after April 15 so be sure to be ready to cover your asparagus if you have a late frost.

USDA Zone Info for Romeoville

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Romeoville

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