The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

You should be able to determine when you can plant iresene by reviewing the USDA zone info for San Marcos.

Planting Calendar for Iresene

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

It's probably not a good idea to plant iresene until after the last frost has passed because they are not cold tolerant.

The earliest that you can plant iresene in San Marcos is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant iresene and expect a good harvest is probably August. Any later than that and your iresene may not have a chance to really do well. You can get started a few weeks earlier by starting your iresene indoors.

Last Frost Date

The average date of last frost is March 15 in San Marcos. You can expect an average low temperature of 15°F in the coldest months of winter.

Remember that USDA zone info for San Marcos is just an average and the actual date of last frost will vary from year to year. Half of the time in San Marcos it frosts late in the year after March 15 so just be sure to be ready to protect your iresene if you have a surprise late frost.

USDA Zone Info for San Marcos

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°F

This means that on a really cold year, the coldest it will get is 15°F. On most years you should be prepared to experience lows near 20°F.

Plants to Grow in San Marcos

You may be interested in your other planting guides for San Marcos.