When can I plant Napa Valley Fern in Zone 5b

The USDA Zone info is a great tool for gardeners to help us figure out our gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for our area.

By looking at the USDA zone info for Zone 5b it's a good idea to determine when it's possible to plant napa valley fern.


Planting Calendar for Napa Valley Fern

Frost tolerance for napa valley fern: Not tolerant of frost.
When you should plant them: After the last frost when the weather gets warmer.

It's probably a bad idea to plant napa valley fern until after the last frost when the weather gets warmer because they require warm weather.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant napa valley fern
Possibly ok, but a risky time to plant napa valley fern
Probably not a good time to plant napa valley fern

The earliest that you can plant napa valley fern in Zone 5b 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 napa valley fern and expect a good harvest is probably August. You probably don't want to wait any later than that or else your napa valley fern may not have a chance to grow to maturity. You can get started a little bit earlier by starting your napa valley fern indoors.

Last Frost Date

The average date of last frost is April 15 in Zone 5b. In the coldest months of winter we can expect an average low temperature of -15°F.

Remember that USDA zone info for Zone 5b is an average and our actual date of last frost can change quite a bit from year to year. Since half of the time in Zone 5b we get a frost after April 15 be ready to protect your napa valley fern in the event of one of those late frosts.

USDA Zone Info for Zone 5b

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)April 15
Average Date of First Frost (fall)October 15
Lowest Expected Low-15°F
Highest Expected Low-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Zone 5b

You may be interested in our other planting guides for Zone 5b.