One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Norco can be used to estimate when it's the best time to plant iresene.

Planting Calendar for Iresene

Frost tolerance for iresene:	Not tolerant of frost.
When to plant:	After all chance of frost has passed.

You can not plant iresene until after the last frost when the weather gets warmer because they are not cold tolerant.

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

Last Frost Date

The average date of last frost is February 15 in Norco. You can expect an average low temperature of 25°F in the coldest months of winter.

Keep in mind that USDA zone info for Norco is an average and the actual date of last frost will vary from year to year. Since half of the time in Norco it frosts late in the year after February 15 be ready to protect your iresene in the event of one of those late frosts.

USDA Zone Info for Norco

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 Norco

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