One of the best tools that you have as gardeners to help us determine your gardening schedule is the 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.

You will be able to figure out when to plant doronicum by reviewing the USDA zone info for Irvine.

Planting Calendar for Doronicum

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

Doronicum can survive in mild cold which means that you can plant them a little bit earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant doronicum in Irvine is January. However, you really should wait until February if you don't want to take any chances.

The last month that you can plant doronicum and expect a good harvest is probably October. If you wait any later than that and your doronicum may not have a chance to grow to maturity. Starting your doronicum indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is January 31 in Irvine. You should expect an average low temperature of 30°F in the coldest months of winter.

Since the USDA zone info for Irvine may not be accurate from year to year the actual date of last frost will vary from year to year. Since half of the time in Irvine you get surprised by a frost after January 31 be ready to cover your doronicum if you have one of those late frosts.

USDA Zone Info for Irvine

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°F

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

Plants to Grow in Irvine

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