When to plant cucumbers in USDA Zone 5b

Plan your cucumbers planting around local frost risk and soil temperature, then work backward from the harvest week your buyers need. The calendar below is a starting point, not a field-level weather forecast.

Chicago, Des Moines suburbs, central IL, upstate NY. Average last spring frost May 1, first fall frost October 6 — a 158-day frost-free season.

Zone fit: good
Cucumbers is frost-tender, so timing the outdoor transplant to the last frost matters more here than in warmer zones. Row cover buys 2 weeks of head start.

Key dates

Start seeds indoors
April 3 – April 17
Direct-seed or transplant outdoors
May 8 – May 29
Expected first harvest
July 9 – August 6
Fall planting window
July 21 – August 11
Fall harvest window
September 21 – October 19

Windows are calculated from your zone's average frost dates. Adjust ±1 week for microclimates, elevation, and your own frost records.

Spacing and soil

Plant spacing
12″
Row spacing
48″
Seed depth
1″
Soil temperature
70–90°F
Frost tolerance
tender
Days to harvest
55 days

Grower notes for Zone 5b

Trellis for cleaner fruit and lower disease pressure. Successive plantings every 3 weeks keep harvest steady.

Plant near: beans, corn, radish

Keep away from: sage, potatoes

Other cucurbits for Zone 5b

Same crop, other zones

Track your own plantings

BAU Farm Intelligence turns these windows into per-field tasks — indoor seed-start reminders, transplant dates, harvest projections — using your farm's actual frost history.