When to Plant Peas in Boise

Can Peas Mature in Boise?

Growing degree days measure how much useful warmth typically accumulates during the season. For peas, this helps estimate whether local heat accumulation is usually enough for the crop to reach maturity on time.

From the usual planting window, Boise typically provides about 4854 growing degree days for peas. With a typical crop target of 600, that leaves a heat margin of +4254. That large heat margin gives gardeners flexibility. Planting can be shifted later and the crop will still mature easily, so the more important effect of timing is on harvest quality and how long the crop stays at its best.

When Is It Too Late to Plant?

If planting later than usual, this table shows how much growing degree day heat is still available from each point in the season. For peas, the table is less about whether the crop will finish and more about how planting date changes harvest timing, crop speed, and the length of the harvest window.

How Different Pea Varieties Affect Results

The season in Boise usually supports most pea varieties comfortably, which means the more useful decision is what kind of crop you want rather than simply how fast it finishes.

Varieties that often fit well here include:

• Alaska — a classic early pea with a strong fit for cool spring planting
• Little Marvel — compact and dependable, with a good fit for many shorter seasons
• Sugar Ann — a favorite early snap pea where gardeners want quick spring production
• Green Arrow — productive and popular, but still best when planted promptly into spring conditions
• Tall Telephone — more exposed where spring turns warm quickly or the planting is delayed

Main risk: Gardeners usually lose quality here by timing the crop poorly rather than by running out of season. The crop matures easily, but late planting often means a shorter and less tender harvest.

How Frost Affects Planting Dates for Peas in Boise

Boise usually has about 148 frost-free days, with a typical last spring frost around May 17 and a typical first fall frost around October 12.

Peas are generally frost tolerant and temperatures below about 24°F ( -4 °C) can slow growth or damage plants.

Peas are usually comfortable with light frost, which makes early planting an advantage rather than a problem. In practice, frost matters less here than timing the crop for cool conditions and good leaf quality.

When this crop disappoints in Boise, the issue is usually management rather than climate fit. Timing, consistency, and harvest decisions matter more than season length.

In Boise, the local season usually gives peas plenty of breathing room when planting happens around April 19. For a better local margin, gardeners usually do best in south-facing walls, sheltered gardens, raised beds, and sunnier urban lots. Cooler spots like low spots, exposed sites, and shadier yards often make timing tighter. For peas, the best local sites often help the crop get moving earlier and make timing a little more forgiving.