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.

By reviewing the USDA zone info for Spearfish you should be able to determine when it's a good idea to plant peas.

Planting Calendar for Peas

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

Peas do well in a bit of cold which tells us that you can plant them much earlier in the year than more sensitive plants.

The earliest that you can plant peas in Spearfish 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. You probably don't want to wait any later than that or else your peas may not have a chance to really do well. You can get started a couple of weeks earlier by starting your peas indoors.

Last Frost Date

The average date of last frost is April 15 in Spearfish. In the coldest months of winter you should expect an average low temperature of -20°F.

Just be sure to remember that USDA zone info for Spearfish is not always accurate and the actual date of last frost can change quite a bit from year to year. Since half of the time in Spearfish last frost occurs after April 15 be ready to cover your peas in the event of one of those late frosts.

USDA Zone Info for Spearfish

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Spearfish

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