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

The first opportunity to plant celeriac in Hillsboro can be figured out by referring to the USDA zone info.

Planting Calendar for Celeriac

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

Celeriac do well in moderate cold which means that you can plant them a little bit earlier than other frost tender plants.

The earliest that you can plant celeriac in Hillsboro 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 celeriac and expect a good harvest is probably September. Any later than that and your celeriac may not have a chance to really do well. You can get started a few weeks earlier by starting your celeriac indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Hillsboro. In the coldest months of winter you can expect an average low temperature of -10°F.

Remember that USDA zone info for Hillsboro is not always accurate and the actual date of last frost changes from year to year. Since half of the time in Hillsboro you get surprised by a frost after April 15 be ready to cover your celeriac if you have a late frost.

USDA Zone Info for Hillsboro

Here is the info for USDA Zone 6a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-10°F
Highest Expected Low	-5°F

This means that on a really cold year, the coldest it will get is -10°F. On most years you should be prepared to experience lows near -5°F.

Plants to Grow in Hillsboro

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