Louisiana · zones 8b–9b
When to plant cucumbers in Louisiana.
Sow between Mar 7 to Jun 6 in a typical year, keyed to Louisiana's median last frost around Feb 28. A second, fall sowing fits Jul 31 to Aug 31. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Cucumbers dates for a typical Louisiana season.
Direct sow
Mar 7 to Jun 6
Keyed to the ~Feb 28 last frost. Sow 1" deep, 12" apart.
Fall round
Jul 31 to Aug 31
Counted back from the ~Dec 1 first frost.
Harvest
~60 days later
~5 lb per plant over ~5 weeks.
Louisiana spans more than one climate: Zone 9 is the most common zone, but the state runs 8b to 9b. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
Louisiana growing notes
Louisiana cucumbers live or die on airflow.
Trellis everything you can
Louisiana's humidity sits high enough, most mornings, that cucumber leaves lying on the ground barely dry out before the next dew or rain arrives, and that constant dampness is exactly what fungal disease needs to spread. Trellising solves more of this than any spray: lift the vines onto a fence or cattle panel and leaves dry within an hour or two of sunrise instead of staying wet most of the morning.
A trellised row can also run closer than a sprawling planting needs, since the leaves stack vertically instead of spreading across the ground competing for the same airspace. Tie or clip young vines to the support weekly until the tendrils take over on their own, usually within the first 3 weeks after they start climbing.
Downy mildew tracks this region specifically
Cucurbit downy mildew is different from most garden diseases in one useful way: it is tracked region by region through the growing season by a national forecasting network, because Gulf South humidity is exactly the kind of weather the disease needs to build up and spread northward each year. Louisiana gardens sit close to the source of that yearly spread, which means local disease pressure often arrives earlier and heavier than it does farther north.
Marketmore 76 and County Fair both carry real resistance to downy and powdery mildew and are worth choosing over a disease-blank slicer for that reason alone. Water the soil, not the leaves, and do it in the morning if you irrigate at all, so any leaf splash has the whole day to dry rather than sitting wet overnight.
Why one long spring planting isn't enough here
Louisiana's cucumber vines decline fast once cucumber beetles and the diseases they spread take hold, which is why sowing a fresh round roughly every 2 to 3 weeks through both the spring and fall windows outproduces one long spring planting by a wide margin here. A fresh planting started while an older one is fading keeps you in cucumbers even after the first block gives out.
Scout for striped and spotted cucumber beetles from the moment seedlings emerge; beyond the direct feeding damage, beetles spread bacterial wilt, which you can test for by cutting a wilted stem and pressing the cut ends together, then slowly pulling them apart. A sticky, stretching thread of sap between the two halves confirms bacterial wilt, and that plant should come out before the disease reaches its neighbors through beetle traffic.
In Louisiana: watch for
The pests that find cucumbers here.
With about 276 frost-free days, cucumber, slicing spends longer in the ground here than in most of the country, which widens the window in which squash bugs can find it. Scout weekly from midseason and act on the first signs.
Gray shield bugs; leaves wilt and get crispy patches.
Organic fix: Crush the copper egg rows under leaves; diatomaceous earth at the base.
Yellow striped or spotted beetles that spread bacterial wilt.
Organic fix: Row cover until the first female flowers open; neem for heavy runs.
Angular yellow patches bounded by the leaf veins, after wet foliage.
Organic fix: Water in the morning, space for airflow, pull badly infected vines.
White powder coating the leaves late in the season.
Organic fix: Space for airflow, water at the base, spray neem.
Your season math: Louisiana gives cucumbers about 276 frost-free days, and it needs roughly 60 days to a first harvest. That fits about 11 re-sown rounds across the season, so you can keep it coming instead of picking once.
Planting cucumbers in Louisiana: questions
When should I plant cucumbers in Louisiana?+
In a typical Louisiana year, sow cucumbers between Mar 7 to Jun 6, keyed to the state's median last frost around Feb 28. There's also a fall window: Jul 31 to Aug 31. Your exact dates shift with your ZIP code and microclimate.
What USDA zone is Louisiana?+
Louisiana spans zones 8b–9b, mostly zone 9. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many cucumbers plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.