One of the first steps you take when you are making a decision about your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

It's possible to figure out when it's possible to plant napa valley fern by using the USDA zone info for Diamond Bar.

Planting Calendar for Napa Valley Fern

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

Since napa valley fern are not cold tolerant you really should wait until after all chance of frost has passed before you can plant them.

The earliest that you can plant napa valley fern in Diamond Bar is February. However, you really should wait until March 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 September. Any later than that and your napa valley fern may not have a chance to really do well. Starting your napa valley fern indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

The average date of last frost is January 31 in Diamond Bar. You should expect an average low temperature of 30°F in the coldest months of winter.

Keep in mind that USDA zone info for Diamond Bar 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 Diamond Bar it frosts late in the year after January 31 so always be ready to cover your napa valley fern if you have a surprise late frost.

USDA Zone Info for Diamond Bar

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°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 35°F.

Plants to Grow in Diamond Bar

You may be interested in your other planting guides for Diamond Bar.