One of the first steps you take when you are figuring out 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.

A common way of determining when it's the best time to plant celery is to check out the USDA zone info for Allentown.

Planting Calendar for Celery

Frost tolerance for celery:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant celery just a tiny bit earlier in the year because they do ok in moderate cold.

The earliest that you can plant celery in Allentown 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 celery and expect a good harvest is probably August. Any later than that and your celery may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your celery indoors.

Last Frost Date

The average date of last frost is April 15 in Allentown. It might get as low as -5°F during the coldest months of winter.

Just be sure to remember that USDA zone info for Allentown is just an average and the actual date of last frost is different every year. Half of the time in Allentown you get surprised by a frost after April 15 so make sure that you are ready to cover your celery if you have a late frost.

USDA Zone Info for Allentown

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in Allentown

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