The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You can estimate when you can plant asparagus lettuce in Zone 4b by referring to the USDA zone info.

Planting Calendar for Asparagus lettuce

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

You should not plant asparagus lettuce until after the last frost because they are not cold tolerant.

The earliest that you can plant asparagus lettuce in Zone 4b is May. However, you really should wait until June 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 really do well. If you are starting your asparagus lettuce indoors then you might be able to get away with starting them a few weeks earlier.

Last Frost Date

On average all chance of frost has passed is on May 15 in Zone 4b. You should expect an average low temperature of -25°F in the coldest months of winter.

Just be sure to remember that USDA zone info for Zone 4b may not be accurate from year to year and the actual date of last frost will vary from year to year. Since half of the time in Zone 4b last frost occurs after May 15 be ready to cover your asparagus lettuce in the event of a late frost.

USDA Zone Info for Zone 4b

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

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

Plants to Grow in Zone 4b

You may be interested in your other planting guides for Zone 4b.