One of the first steps you take when you are determining your gardening schedule is find your 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 determine when it's possible to plant mimulus by using the USDA zone info for Healdsburg.

Planting Calendar for Mimulus

Frost tolerance for mimulus:	Not tolerant of frost.
When to plant:	After the last frost.

Mimulus require warm weather which means that it is necessary to wait until it warms up after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant mimulus in Healdsburg 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 mimulus and expect a good harvest is probably September. You probably don't want to wait any later than that or else your mimulus may not have a chance to grow to maturity. Starting your mimulus indoors is a great way to get them started a little bit earlier.

Last Frost Date

The average date of last frost is February 15 in Healdsburg. It might get as low as 25°F during the coldest months of winter.

Keep in mind that USDA zone info for Healdsburg is an average and the actual date of last frost is different every year. Half of the time in Healdsburg it frosts late in the year after February 15 so always be ready to protect your mimulus 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.