Spinach

Growing Spinach in Zone 6b

A complete, zone-6b timeline for Spinach — when to start, transplant, and harvest, tuned to this zone's typical frost dates (St. Louis, Cincinnati, Boston).

April 16Last spring frost
October 22First fall frost
about 189 daysGrowing season
−10 to 0°FWinter low

Your planting timeline

  1. Direct sowonce soil warms, around April 16
  2. Harvestabout 37–50 days from transplant

Best varieties for zone 6b

A wide range works; sow smooth-leaf Space or semi-savoy Tyee in spring and savoy Bloomsdale in fall, succession-sowing through both cool shoulders.

Growing notes

Spinach needs steady, even moisture — about 1 to 1.5 inches of water per week — to keep its shallow roots cool and the leaves tender and mild. Let the bed dry out and stressed plants bolt early and turn bitter, so water consistently rather than in feast-or-famine swings. Aim to keep the top inch or two of soil reliably damp but never waterlogged, since soggy ground invites damping-off and downy mildew. Water at the base in the morning so the foliage dries quickly, which discourages leaf disease in cool, humid weather. A light mulch of straw or shredded leaves steadies soil moisture and keeps spring rain from splashing grit onto the low-growing leaves.

Recommended supplies

Affiliate links — we may earn a small commission at no cost to you.