One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You can figure out when it's the best time to plant pumpkins in Diamond Bar by referring to the USDA zone info.

Planting Calendar for Pumpkins

Frost tolerance for pumpkins:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

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

The earliest that you can plant pumpkins in Diamond Bar 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 pumpkins and expect a good harvest is probably September. Any later than that and your pumpkins may not have a chance to really do well. You can get started a couple of weeks earlier by starting your pumpkins indoors.

Last Frost Date

The average date of last frost is January 31 in Diamond Bar. You should expect an average low temperature of 30°F in the coldest months of winter.

Since the USDA zone info for Diamond Bar is not always accurate the actual date of last frost can change quite a bit from year to year. Half of the time in Diamond Bar you get surprised by a frost after January 31 so make sure that you are ready to cover your pumpkins in the event of a late frost.

USDA Zone Info for Diamond Bar

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 Diamond Bar

You may be interested in your other planting guides for Diamond Bar.