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 possible to plant bells of ireland by referring to the USDA zone info for National City.

Planting Calendar for Bells of Ireland

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

Bells of Ireland do well in a tiny bit of cold which tells us that you can plant them a bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant bells of ireland in National City 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 bells of ireland and expect a good harvest is probably September. If you wait any later than that and your bells of ireland may not have a chance to really do well. Starting your bells of ireland indoors is a great way to get them started a few weeks earlier.

Last Frost Date

The average date of last frost is January 31 in National City. It might get as low as 35°F during the coldest months of winter.

Remember that USDA zone info for National City is just an average and the actual date of last frost changes from year to year. Half of the time in National City it frosts late in the year after January 31 so just be sure to be ready to cover your bells of ireland in the event of a surprise late frost.

USDA Zone Info for National City

Here is the info for USDA Zone 10b.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	35°F
Highest Expected Low	40°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 40°F.

Plants to Grow in National City

You may be interested in your other planting guides for National City.