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.

You will be able to determine when it's the best time to plant celery by referring to the USDA zone info for Harlingen.

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 are barely cold tolerant.

The earliest that you can plant celery in Harlingen 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 celery and expect a good harvest is probably September. If you wait any later than that and your celery may not have a chance to really do well. You can get started a little bit earlier by starting your celery indoors.

Last Frost Date

The average date of last frost is February 15 in Harlingen. In the coldest months of winter you should expect an average low temperature of 25°F.

Since the USDA zone info for Harlingen is not always accurate the actual date of last frost will vary from year to year. Since half of the time in Harlingen you get surprised by a frost after February 15 be ready to cover your celery if you have a surprise late frost.

USDA Zone Info for Harlingen

Here is the info for USDA Zone 9b.

Average Date of Last Frost (spring)	February 15
Average Date of First Frost (fall)	December 15
Lowest Expected Low	25°F
Highest Expected Low	30°F

This means that on a really cold year, the coldest it will get is 25°F. On most years you should be prepared to experience lows near 30°F.

Plants to Grow in Harlingen

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