One of the first steps you take when you are getting a good idea your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You will be able to figure out when it's possible to plant asparagus fern by reviewing the USDA zone info for Miles City.

Planting Calendar for Asparagus Fern

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

Asparagus Fern are not cold tolerant which tells us that you must wait until it warms up after the last frost before you can plant them.

The earliest that you can plant asparagus fern in Miles City 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. Starting your asparagus fern indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on May 15 in Miles City. It might get as low as -30°F during the coldest months of winter.

Since the USDA zone info for Miles City is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in Miles City it frosts late in the year after May 15 so just be sure to be ready to cover your asparagus fern if you have a late frost.

USDA Zone Info for Miles City

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Miles City

You may be interested in your other planting guides for Miles City.