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.

You should be able to determine when it's the best time to plant asparagus fern by referring to the USDA zone info for Stillwater.

Planting Calendar for Asparagus Fern

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

You should not plant asparagus fern until after the last frost when the weather gets warmer because they are not cold tolerant.

The earliest that you can plant asparagus fern in Stillwater 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. You probably don't want to wait any later than that or else your asparagus fern may not have a chance to grow to maturity. You can get started a little bit earlier by starting your asparagus fern indoors.

Last Frost Date

On average the last frost has passed is on May 15 in Stillwater. It might get as low as -25°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Stillwater is an average and the actual date of last frost changes from year to year. Half of the time in Stillwater it frosts late in the year after May 15 so always be ready to cover your asparagus fern if you have a surprise late frost.

USDA Zone Info for Stillwater

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 Stillwater

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