Fall Peas in Zone 6 and 7: When to Plant, Which Varieties, and Whether It Is Worth It

Fall peas have to be in the ground by August 14 in zone 6a, August 19 in zone 6b, August 26 in zone 7a and September 2 in zone 7b. Those are deadlines, not suggestions, and they are much earlier than the weather makes them feel. You sow a cool-season crop in the hottest fortnight of the year, which is the whole difficulty of the exercise.

The dates come from the same subtraction used for every fall crop on this site: 60 days to maturity, plus 14 days for the slowdown in autumn light, minus the 14 days a pea vine keeps producing once light frosts begin. That is 60 days before your first frost. In zone 6a, sowing on the deadline puts the first picking right on October 13, which is the average first frost date, and an average is a coin flip. That single fact is why fall peas are a reasonable plan in zone 7 and a gamble in zone 6a.

Your frost date decides everything here

Fall pea dates for zones 5b through 8a

Sow at the front of the window rather than the back wherever you can. Every day earlier is a day of harvest that happens before the weather turns, and the only cost is germinating into slightly hotter soil. The full set of per-zone dates is on the peas crop page, with the two zones people search for most broken out at peas in zone 6a and peas in zone 7a.

The two problems, at opposite ends of the crop

A spring pea crop has one problem: getting it in early enough that it finishes before heat. A fall crop has two, and they pull in opposite directions.

Heat at sowing. Pea seed germinates well in cool, moist soil and badly in warm soil. Above roughly 80 degrees the germination rate drops off sharply, and warm wet soil is also where pea seed rots before it sprouts. Sowing on August 14 in zone 6a means sowing into exactly those conditions. This is where most fall pea crops are lost, before anything green appears.

Frost at harvest. Pea vines and leaves take light frost without much damage, which is why the arithmetic gives the crop 14 days of tolerance. Blossoms and small pods are more tender than the foliage. A hard freeze ends the crop regardless of how the vines look, and a run of nights in the upper 20s will stop pod fill even when the plants survive. So the effective harvest window is the stretch between the first light frost and the first real freeze, and in zone 6 that stretch is short.

Put those together and the reason zone 7 works better becomes obvious. The later sowing date means slightly less brutal soil at germination, and the later frost date means a longer picking window at the other end.

Varieties that finish in time

Days to maturity is the variable you have the most control over, and the difference between an early variety and a main-season one is the difference between picking and not picking.

Look for the earliest types you can find, in the 50 to 60 day range rather than the 70 day range. A few examples of the kind of variety that fits:

Sugar Ann is a bush snap pea that stays short enough to grow with minimal support, which matters in fall when you may be putting a trellis over a bed you are about to mulch anyway. It is one of the earliest snap types.

Sugar Snap is the classic tall snap pea and it is genuinely better eating, but it is later and it climbs high, so it needs a full trellis and more days than a zone 6a fall crop has. Save it for spring unless you are in zone 7b or 8.

Little Marvel is a compact shelling pea, early, and does not need much height.

Alaska is an early smooth-seeded shelling pea that tolerates cool soil better than wrinkled-seeded types. Smooth seed also resists rotting in wet ground, which is useful at both ends of the year.

Snow peas deserve a mention on their own. Because the pod is picked flat and immature, a snow pea is ready earlier than the same plant would be if you waited for peas to fill. That is a free week or two in a crop where a week decides everything.

Whatever you pick, read the packet rather than trusting a variety name. Seed companies list different maturity figures for the same variety, and in fall you want the lowest honest number in the catalogue.

How to get fall peas up in August heat

Pre-sprout the seed. Soak the peas for eight to twelve hours, no longer, then drain and spread them between damp paper towels in a covered container somewhere cool. In two or three days most of them will show a white root tip. Plant those and discard the ones that did nothing. This skips the days the seed would have spent sitting in hot soil at risk of rotting, and it tells you your germination rate before you commit the row.

Water the furrow, then sow. Draw the furrow deeper than you need, soak it, let it drain, then set the seed and cover with dry soil. The seed then sits in cool damp soil rather than dry dust, and the dry cover layer slows evaporation.

Sow thickly. Double what you would use in spring. Some seed will fail whatever you do, and a thin stand of peas never catches up.

Shade the row until the shoots are up. A light shade cloth, the 30 to 40 percent kind, laid over hoops or simply pegged over the row makes a real difference to soil temperature in the top inch, which is exactly the inch that matters. A board laid flat over the furrow does the same job for free as long as you lift it the day the shoots appear. Straw mulch either side of the row after germination keeps the soil cooler for the rest of the crop.

Use the inoculant. It will not speed anything up, but in a bed that has not grown legumes in a few years it produces visibly better vines, and a packet costs less than the seed does.

Put the trellis up at sowing. Even bush types flop, and trying to thread a net through a row of established fall peas in late September is a job nobody enjoys. Netting on two stakes takes ten minutes now.

Choose the bed for afternoon shade. In spring you want a pea bed in full sun. In August, a bed that loses the sun by mid afternoon germinates far better, and by the time the crop is filling pods the sun is low enough that it makes little difference.

When fall peas are not worth it

This is the part most fall pea articles leave out.

In zone 6a, a fall pea crop fails more often than it succeeds unless you sow by mid August. The deadline sowing produces its first picking on the average first frost date, and an average first frost date is a 50 percent probability, so half of all years are earlier. Add a poor August germination and the crop is often a thin row of vines that never gets going. If you sow by around August 1, at the front of the window, the odds improve substantially, and that is the honest recommendation for 6a: early or not at all.

In zone 6b, it is about a coin flip at the deadline and a good bet at the front of the window. The extra five days matter more than they sound like they should.

In zone 7a and 7b, fall peas are worth the bed. The sowing is still hot but the harvest window is long enough to be worth planting for, and a late October picking of snap peas is a genuinely different pleasure from a June one.

If you are in zone 6a with limited space, the better use of the same bed in mid August is spinach, which does not need to mature before winter at all, or a row of radishes, which need only 21 days of clear weather. Both are near certainties where fall peas are a gamble. The fall planting calendar by zone lists the sow-by dates side by side so you can see what else that bed could be doing.

If you are reading this in late September

The window has closed in zones 5 through 8 for this year. There is no version of a late September pea sowing that produces peas outside zone 9 and warmer, where the sow-by date runs into October.

The useful thing to do with the date now is to put it in next year’s calendar, in July, because that is when the decision actually gets made. Everything about fall peas is set by a choice you make six weeks before the weather gives you any reason to think about it.

Overwintering peas, the other option

In zone 7 and warmer there is a third approach that avoids the heat problem entirely: sow in late fall, let the plants come up small, and overwinter them under a row cover for an early spring crop. Hardy varieties bred for this exist, and gardeners in mild maritime climates use them routinely.

It is not a fall harvest, and it is not reliable in zone 6, where an open winter can kill the seedlings outright. But in zone 7b and 8 it is a way to get peas weeks before a spring sowing would, without ever having to germinate seed in August.