The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Tomah should be looked at to estimate when it's the best time to plant asparagus fern.

Planting Calendar for Asparagus Fern

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

It's probably a bad idea to plant asparagus fern until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant asparagus fern in Tomah 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 fern and expect a good harvest is probably August. Any later than that and your asparagus fern may not have a chance to really do well. Starting your asparagus fern indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is May 15 in Tomah. You should expect an average low temperature of -25°F in the coldest months of winter.

Since the USDA zone info for Tomah is just an average the actual date of last frost changes from year to year. Since half of the time in Tomah you get surprised by a frost after May 15 be ready to protect your asparagus fern in the event of a late frost.

USDA Zone Info for Tomah

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 Tomah

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