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 first chance to plant sweet corn in Healdsburg should be figured out by looking at the USDA zone info.

Planting Calendar for Sweet corn

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

Since sweet corn are one of those plants that can tolerate a tiny bit of cold weather you can plant them a bit earlier in the year than other frost tender plants.

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

Last Frost Date

On average the last frost when the weather gets warmer is on February 15 in Healdsburg. It might get as low as 25°F during the coldest months of winter.

Since the USDA zone info for Healdsburg is an average the actual date of last frost will vary from year to year. Half of the time in Healdsburg it frosts late in the year after February 15 so make sure that you are ready to protect your sweet corn in the event of a surprise late frost.

USDA Zone Info for Healdsburg

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 Healdsburg

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