When to Plant Spinach in Maine
Direct Sow Outdoors
Monday, March 9, 2026
State
Maine
USDA Zones
3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a
Avg Last Frost
Monday, April 20, 2026
Cities Covered
458
Maine Planting Schedule by Zone
Maine spans 8 zones — find yours below for the most accurate dates.
| Zone | Last Frost | Direct Sow |
|---|---|---|
| 3b | Wednesday, May 20, 2026 | Wednesday, April 8, 2026 |
| 4a | Friday, May 15, 2026 | Friday, April 3, 2026 |
| 4b | Tuesday, May 5, 2026 | Tuesday, March 24, 2026 |
| 5a | Sunday, May 10, 2026 | Sunday, March 29, 2026 |
| 5b | Saturday, April 25, 2026 | Saturday, March 14, 2026 |
| 6a | Monday, April 20, 2026 | Monday, March 9, 2026 |
| 6b | Wednesday, April 15, 2026 | Wednesday, March 4, 2026 |
| 7a | Friday, April 10, 2026 | Friday, February 27, 2026 |
Dates based on average last frost. Check your local forecast before planting.
🌿 About Spinach
🤝 Companion Plants for Spinach
Good Companions
Growing Spinach in Maine: Complete Guide
Spinach (Spinacia oleracea) is a crop that grows best when sown directly in the garden. In Maine, the right time to direct sow is around Monday, March 9, 2026, once soil temperatures are consistently warm enough for germination.
Because Maine stretches across 8 USDA hardiness zones (3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a), planting windows can shift by as much as six to eight weeks from one end of the state to the other. Gardeners in the warmer southern zones can start earlier, while those in cooler northern zones should wait until the zone table above shows their last frost has passed.
With 40 days to maturity, Spinach fits comfortably within Maine's growing season in most zones. In the warmest parts of the state, a second planting later in the season may be possible.
Spinach requires partial shade to full sun and regular (keep moist) moisture. Most of Maine receives adequate sunlight during the growing season, though gardeners in humid eastern regions should watch for fungal issues and ensure good air circulation.
For the most precise planting dates tailored to your exact location, enter your ZIP code on our planting calendar or use the zone table above to find the schedule for your area of Maine.
Growing Spinach in Maine: Local Tips
Climate-specific advice for Maine gardeners.
Sow as soon as the ground thaws
In Zone 5–6, broadcast spinach seed directly on snow in late February–early March (it germinates when temperatures allow); this "snow seeding" technique produces some of the earliest harvests possible.
Overwinter for spring's first harvest
Sow in September and mulch lightly after the ground freezes; spinach rosettes overwinter under the mulch and produce the earliest spring greens — often March in Zone 6.
Frequently Asked Questions
When should I plant Spinach in Maine?
In Maine, direct sow Spinach outdoors around Monday, March 9, 2026. Maine spans zones 3b–7a, so gardeners in warmer zones can plant earlier.
What is the last frost date in Maine?
Maine spans 8 USDA zones (3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a), so last frost dates vary by region. Clayton Lake, Estcourt Station (3b) sees frost until around Wednesday, May 20, 2026, while Matinicus (7a) is frost-free much earlier.
How long does Spinach take to grow in Maine?
Spinach takes about 40 days from transplant (or direct sow) to harvest. In Maine's longer-season zones, a second planting in late summer may be possible.
What USDA zones does Maine cover for Spinach?
Maine includes zones 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a. Spinach grows well across all of these zones with adjusted timing — use the zone table above to find the right dates for your part of the state.
Find Precise Dates for Your City
Select a city for exact planting dates based on local frost records.