The USDA Zone info is a great tool for gardeners to help us estimate your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

By reviewing the USDA zone info for Boulder you should be able to determine when you can plant peas.

Planting Calendar for Peas

Frost tolerance for peas:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

You can plant peas earlier in the year because they do well in cold.

The earliest that you can plant peas in Boulder 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 peas and expect a good harvest is probably September. If you wait any later than that and your peas may not have a chance to really do well. Starting your peas indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average the last frost is on April 15 in Boulder. It might get as low as -15°F during the coldest months of winter.

It's important to remember that USDA zone info for Boulder is not always accurate and the actual date of last frost is different every year. Since half of the time in Boulder it frosts late in the year after April 15 be ready to cover your peas if you have one of those late frosts.

USDA Zone Info for Boulder

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Boulder

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