Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. 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 San Juan should be read to estimate when to plant squash.

Planting Calendar for Squash

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

Since squash require warm weather it is necessary to wait until after the last frost before you can plant them.

The earliest that you can plant squash in San Juan 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 squash and expect a good harvest is probably September. You probably don't want to wait any later than that or else your squash may not have a chance to really do well. Starting your squash indoors is a great way to get them started a couple of weeks earlier.

Last Frost Date

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

Since the USDA zone info for San Juan may not be accurate from year to year the actual date of last frost will vary from year to year. Since half of the time in San Juan it frosts late in the year after February 15 be ready to cover your squash in the event of a surprise late frost.

USDA Zone Info for San Juan

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 San Juan

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