Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

By using the USDA zone info for Sulphur you will be able to figure out when it's a good idea to plant napa valley fern.

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 do not do well in cold weather you really should wait until after the last frost before you can plant them.

The earliest that you can plant napa valley fern in Sulphur 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 napa valley fern and expect a good harvest is probably September. 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. Starting your napa valley fern indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is February 15 in Sulphur. It might get as low as 20°F during the coldest months of winter.

Since the USDA zone info for Sulphur may not be accurate from year to year the actual date of last frost is different every year. Half of the time in Sulphur last frost occurs after February 15 so always be ready to cover your napa valley fern if you have one of those late frosts.

USDA Zone Info for Sulphur

Here is the info for USDA Zone 9a.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	20°F
Highest Expected Low	25°F

This means that on a really cold year, the coldest it will get is 20°F. On most years you should be prepared to experience lows near 25°F.

Plants to Grow in Sulphur

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