When to Plant Peas in Pennsylvania
Peas are a race against summer. They grow and produce in cool weather, stop producing when heat arrives, and die outright once temps consistently hit the upper 70s. In Pennsylvania, that gives most of us a spring window of roughly 8–10 weeks — which is plenty of time for a great harvest if you start at the right moment.
The right moment varies quite a bit across PA. Zone 7a gardeners near Philadelphia can often get peas in the ground by late February. Zone 5a gardeners in the mountains may not plant until mid-April. Below is the full breakdown by zone, plus how to use soil temperature to nail the timing without relying on calendar dates alone.
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Table of Contents
PA Pea Growing Season Timeline
Quick Reference
Soil Temperature: The Real Trigger
Calendar dates are a useful starting point, but soil temperature is the real indicator. Pea seeds germinate in soil as cool as 40°F, though germination is slow and uneven that cold. The sweet spot is 45–65°F — you’ll see sprouts in 7–14 days in that range.
Above 70°F soil temp, germination slows down again. Above 80°F, germination essentially fails. That’s why fall planting in PA can be tricky — by August, the soil is often too warm for good germination until late in the month.
A cheap soil thermometer takes the guesswork out of this completely. Take the reading 2–3 inches deep in the morning, which gives you the most stable reading.
Spring Planting Dates by Zone
The general rule for pea planting in PA is 4–6 weeks before your last average frost date. Peas can handle frost, so you’re not waiting for frost-free conditions — you’re waiting for the soil to thaw and warm to at least 40°F.
| PA Zone | Avg Last Frost | Earliest Planting | Ideal Planting Window | Latest Safe Planting |
|---|---|---|---|---|
| 7a (Philadelphia) | March 30 | Late February | Late Feb – mid-March | April 1 |
| 6b (Reading, York, Allentown) | April 12–14 | Early March | Early–mid March | April 15 |
| 6a (Pittsburgh, Harrisburg, Lancaster) | April 10–20 | Mid-March | Mid–late March | April 20 |
| 5b (Scranton, Wilkes-Barre, Erie) | April 24–May 1 | Late March | Late March – early April | May 1 |
| 5a (Mountains, Northern Tier) | May 10–15 | Early April | Early–mid April | May 10 |
“Latest safe planting” assumes a 65-day variety. If you’re planting later than these dates, switch to a faster-maturing variety (Cascadia at 60 days, Sugar Ann at 52 days). Count forward from your planting date and make sure harvest falls before sustained 80°F days arrive — typically late June to early July in most of PA.
12-City Planting Schedule
| City | Zone | Ideal Planting Window | Expected Harvest Start |
|---|---|---|---|
| Philadelphia | 7a | Feb 20 – Mar 15 | Late April – early May |
| Chester / Media | 7a | Feb 20 – Mar 15 | Late April – early May |
| Reading | 6b | Mar 5 – Mar 20 | Early–mid May |
| Allentown / Bethlehem | 6b | Mar 5 – Mar 20 | Early–mid May |
| York | 6b | Mar 5 – Mar 20 | Early–mid May |
| Lancaster | 6a | Mar 15 – Apr 1 | Mid–late May |
| Harrisburg | 6a | Mar 15 – Apr 1 | Mid–late May |
| Pittsburgh | 6a | Mar 15 – Apr 1 | Mid–late May |
| State College | 6a | Mar 20 – Apr 5 | Late May |
| Scranton / Wilkes-Barre | 5b | Mar 25 – Apr 10 | Late May – early June |
| Erie | 5b | Mar 25 – Apr 10 | Late May – early June |
| Bradford / Potter County | 5a | Apr 5 – Apr 20 | Early–mid June |
Succession Planting
One of the best moves with peas is succession planting — making 2–3 sowings spaced 2 weeks apart rather than one large planting. This spreads the harvest over 4–6 weeks instead of having everything ripen at once.
In zone 6a, for example, you might plant on March 15, April 1, and April 15. The April 15 planting may hit a bit of summer heat toward the end of its life, so choose a faster or more heat-tolerant variety (Wando, Cascadia) for that last succession. The early plantings get the full cool spring; the later ones clean up stragglers.
In zone 5a and 5b where the window is shorter, succession planting is harder to execute. You may only have room for one or two plantings before heat arrives. Focus on getting the first sowing in early, and if you do a second, make it a fast-maturing bush variety.
Fall Planting (Zones 6b–7a)
Fall peas are an underused option for gardeners in southeastern Pennsylvania. Zones 6b and 7a have long enough autumns that peas planted in mid-to-late August can produce a harvest in October before hard frost arrives.
The challenge is getting seeds to germinate in August heat. Soil temps are usually still in the 70s–80s°F in early August — above the ideal germination range. Wait until soil cools to below 70°F, typically around mid-to-late August depending on the year, before planting fall peas.
| Zone | Plant Fall Peas | Avg First Fall Frost | Expected Harvest |
|---|---|---|---|
| 7a (Philadelphia) | Aug 15–Sept 1 | November 15–20 | October – early November |
| 6b (Reading, York) | Aug 10–25 | October 25–Nov 1 | Mid–late October |
For fall planting, choose the fastest varieties: Sugar Ann (52 days), Cascadia (60 days), or Dwarf Gray Sugar (57 days). You’re counting backward from your average first frost — you need at least 55–65 days of frost-free weather after planting to harvest before a killing frost.
Zone Planting Calculator
Select your zone for a highlighted view of your planting windows:
| Zone | Spring Plant | Expected Harvest | Fall Plant | Best Variety |
|---|---|---|---|---|
| 5a (Mountains) | Apr 5–20 | Early–mid June | Not recommended | Sugar Ann, Little Marvel |
| 5b (Scranton/Erie) | Mar 25–Apr 10 | Late May–early June | Not recommended | Cascadia, Oregon Sugar Pod II |
| 6a (Pittsburgh/Harrisburg) | Mar 15–Apr 1 | Mid–late May | Not recommended | Super Sugar Snap, Lincoln |
| 6b (Reading/York) | Mar 5–20 | Early–mid May | Aug 10–25 | Sugar Snap, Oregon Sugar Pod II |
| 7a (Philadelphia) | Feb 20–Mar 15 | Late April–early May | Aug 15–Sep 1 | Sugar Snap, Mammoth Melting Sugar |
Season planning: Check our month-by-month Pennsylvania planting guide to keep your garden producing all year. Browse all Pennsylvania vegetable guides for companion planting Frequently Asked Questions About When to Plant Peas in Pennsylvania
When is the best time to plant peas in Pennsylvania?
When is the best time to plant peas in Pennsylvania?
The ideal spring planting window depends on your zone. Zone 7a (Philadelphia): late February to mid-March. Zone 6a (Pittsburgh, Harrisburg): mid to late March. Zone 5b (Scranton, Erie): late March to early April. Zone 5a (mountains): early to mid-April. Peas can handle frost, so you don’t wait for frost-free conditions — you wait for soil temperatures to hit 40°F.
Can you plant peas in April in Pennsylvania?
Can you plant peas in April in Pennsylvania?
Yes — for zones 5a and 5b, April is the primary planting window. For zones 6a–6b, early April still works but is on the late side; choose faster-maturing varieties (Cascadia at 60 days). For zone 7a, April planting is too late — you’ll be racing against summer heat from the start. If you’re in the Philadelphia area and missed your March window, plant Sugar Ann (52 days) and hope for a cool June.
Is it too late to plant peas in May in Pennsylvania?
Is it too late to plant peas in May in Pennsylvania?
For most of PA, May is too late for a reliable spring pea harvest. By the time a May planting would be producing (July), summer heat has typically ended the season. The one exception is zone 5a (mountain areas) where May 1–10 is the tail end of the viable planting window. If you’re in zone 5a and plant Sugar Ann (52 days) by May 10, you can still get a June harvest before heat arrives.
How cold is too cold to plant peas in PA?
How cold is too cold to plant peas in PA?
Pea seeds can germinate in soil as cold as 40°F, though germination will be slow (up to 3 weeks). The real risk is planting into frozen or near-frozen soil that stays cold for extended periods — seeds can rot before germinating. If your soil temperature at 2-inch depth is consistently above 40°F and the soil is workable (not frozen or waterlogged), you’re fine to plant even if air temperatures are still in the 30s.
What happens if peas are planted too late in Pennsylvania?
What happens if peas are planted too late in Pennsylvania?
Late-planted peas hit summer heat before they finish producing. Once daytime temperatures consistently reach the upper 70s and low 80s, peas stop setting pods and the vines begin to yellow and decline. You may get a small harvest from whatever pods formed before heat arrived, but the bulk of the potential yield is lost. Powdery mildew also moves in fast on heat-stressed pea plants.
Can I grow peas in the fall in Pennsylvania?
Can I grow peas in the fall in Pennsylvania?
In zones 6b and 7a (southeastern PA including the Philadelphia area, Reading, and York), fall planting is viable. Plant fast-maturing varieties like Sugar Ann (52 days) or Cascadia (60 days) in mid-to-late August. The challenge is that soil temps may still be too warm for good germination in early August — wait until soil cools below 70°F. In zone 6a and colder, fall pea planting is generally not reliable because first frost arrives too early.
