The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You should be able to estimate when it's a good idea to plant celeriac by using the USDA zone info for Bethel.

Planting Calendar for Celeriac

Frost tolerance for celeriac:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since celeriac do well in moderate cold you can plant them a little earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant celeriac in Bethel 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 celeriac and expect a good harvest is probably August. Any later than that and your celeriac may not have a chance to grow to maturity. Starting your celeriac indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on May 15 in Bethel. It might get as low as -35°F during the coldest months of winter.

Since the USDA zone info for Bethel is just an average the actual date of last frost is different every year. Since half of the time in Bethel it frosts late in the year after May 15 be ready to protect your celeriac in the event of a late frost.

USDA Zone Info for Bethel

Here is the info for USDA Zone 3b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-35°F
Highest Expected Low	-30°F

This means that on a really cold year, the coldest it will get is -35°F. On most years you should be prepared to experience lows near -30°F.

Plants to Grow in Bethel

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