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.

It's possible to determine when it's possible to plant dallas fern by looking at the USDA zone info for Portland.

Planting Calendar for Dallas Fern

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

Since dallas fern require warm weather it is necessary to wait until after the last frost has passed before you can plant them.

The earliest that you can plant dallas fern in Portland is April. However, you really should wait until May 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. You probably don't want to wait any later than that or else your dallas fern may not have a chance to grow to maturity. If you are starting your dallas fern indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

The average date of last frost is April 15 in Portland. In the coldest months of winter you should expect an average low temperature of 0°F.

Keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for Portland and it will vary from year to year. Half of the time in Portland last frost occurs after April 15 so always be ready to protect your dallas fern if you have a late frost.

USDA Zone Info for Portland

Here is the info for USDA Zone 7a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	0°F
Highest Expected Low	5°F

This means that on a really cold year, the coldest it will get is 0°F. On most years you should be prepared to experience lows near 5°F.

Plants to Grow in Portland

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