One of the best tools that you have as gardeners to help us determine your gardening schedule is the 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.

The USDA zone info for Mill Valley can be used to determine when it's a good idea to plant squash.

Planting Calendar for Squash

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

It's not a good idea to plant squash until after all chance of frost has passed because they do not do well in cold weather.

The earliest that you can plant squash in Mill Valley 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 squash and expect a good harvest is probably September. If you wait any later than that and your squash may not have a chance to grow to maturity. You can get started a little bit earlier by starting your squash indoors.

Last Frost Date

In Mill Valley the average date of last frost happens on January 31. It might get as low as 30°F during the coldest months of winter.

Remember that the actual date of last frost is not always accurate because it is based on the USDA zone info for Mill Valley and it can change quite a bit from year to year. Half of the time in Mill Valley last frost occurs after January 31 so make sure that you are prepared to protect your squash in the event of a late frost.

USDA Zone Info for Mill Valley

Here is the info for USDA Zone 10a.

Average Date of Last Frost (spring)	January 31
Average Date of First Frost (fall)	December 15
Lowest Expected Low	30°F
Highest Expected Low	35°F

This means that on a really cold year, the coldest it will get is 30°F. On most years you should be prepared to experience lows near 35°F.

Plants to Grow in Mill Valley

You may be interested in your other planting guides for Mill Valley.