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.

In Morro Bay you can figure out when it's a good idea to plant iresene by referring to the USDA zone info.

Planting Calendar for Iresene

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

Iresene require warm weather which means that you need to wait until it warms up after all chance of frost has passed before you can plant them.

The earliest that you can plant iresene in Morro Bay 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. Any later than that and your iresene may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your iresene indoors.

Last Frost Date

On average the last frost is on February 15 in Morro Bay. In the coldest months of winter you should expect an average low temperature of 25°F.

Since the USDA zone info for Morro Bay is just an average the actual date of last frost is different every year. Since half of the time in Morro Bay it frosts late in the year after February 15 be ready to cover your iresene if you have a surprise late frost.

USDA Zone Info for Morro Bay

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 Morro Bay

You may be interested in your other planting guides for Morro Bay.