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.

The USDA zone info for Bourbonnais can be reffered to in order to determine when to plant asparagus lettuce.

Planting Calendar for Asparagus lettuce

Frost tolerance for asparagus lettuce:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

It's probably not a good idea to plant asparagus lettuce until after the last frost because they do not do well in cold weather.

The earliest that you can plant asparagus lettuce in Bourbonnais is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant asparagus lettuce and expect a good harvest is probably August. Any later than that and your asparagus lettuce may not have a chance to grow to maturity. Starting your asparagus lettuce indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

In Bourbonnais the average date of last frost happens on April 15. It might get as low as -15°F during the coldest months of winter.

Since the USDA zone info for Bourbonnais is just an average the actual date of last frost will vary from year to year. Since half of the time in Bourbonnais you get a frost after April 15 be ready to protect your asparagus lettuce in the event of a surprise late frost.

USDA Zone Info for Bourbonnais

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 Bourbonnais

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