One of the best tools that you have as gardeners to help us determine your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Decorah you can determine when you can plant dallas fern by using the USDA zone info.

Planting Calendar for Dallas Fern

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

Dallas Fern do not do well in cold weather which tells us that you need to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant dallas fern in Decorah 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 dallas fern and expect a good harvest is probably August. If you wait any later than that and your dallas fern may not have a chance to fully mature. Starting your dallas fern indoors is a great way to get them started a few weeks earlier.

Last Frost Date

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

Remember that USDA zone info for Decorah is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Decorah it frosts late in the year after May 15 so make sure that you are ready to cover your dallas fern if you have one of those late frosts.

USDA Zone Info for Decorah

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 Decorah

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