Before planting it is a good idea to find your USDA Zone info to determine 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 earliest that you can plant asparagus in Superior should be figured out by referring to the USDA zone info.

Planting Calendar for Asparagus

Frost tolerance for asparagus:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Asparagus do ok in pretty solid cold which tells us that you can plant them quite a bit earlier in the year than other plants that might not handle the cold.

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

The last month that you can plant asparagus and expect a good harvest is probably August. Any later than that and your asparagus may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your asparagus indoors.

Last Frost Date

The average date of last frost is May 15 in Superior. In the coldest months of winter you can expect an average low temperature of -25°F.

Since the USDA zone info for Superior may not be accurate from year to year the actual date of last frost can change quite a bit from year to year. Half of the time in Superior you get a frost after May 15 so make sure that you are ready to cover your asparagus in the event of a surprise late frost.

USDA Zone Info for Superior

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 Superior

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