USDA Zone 4a Planting Calendar (2026)
Zone 4a (-30 to -25°F) has an average last spring frost on May 10 and first fall frost on Sep 25 — about 138 growing days. Typical areas: northern Wisconsin, Fargo ND.
| Vegetable | Start Indoors | Sow / Transplant | Harvest From |
|---|---|---|---|
| Beet | — | Apr 12 | Jun 6 |
| 🥦 Broccoli | Apr 5 | Apr 26 | Jun 30 |
| 🫘 Bush Beans | — | May 17 | Jul 11 |
| 🥬 Cabbage | Mar 29 | Apr 26 | Jul 15 |
| 🥕 Carrot | — | Apr 19 | Jun 28 |
| 🥦 Cauliflower | Mar 29 | Apr 26 | Jul 10 |
| 🌽 Corn | — | May 24 | Aug 12 |
| 🥒 Cucumber | Apr 19 | May 24 | Jul 18 |
| 🧄 Garlic | — | Oct 25 | Jun 22 |
| 🥬 Kale | Apr 5 | Apr 19 | Jun 13 |
| 🥬 Lettuce | Apr 12 | Apr 19 | Jun 3 |
| 🧅 Onion | Mar 1 | Apr 12 | Jul 21 |
| 🟢 Peas | — | Mar 29 | May 28 |
| 🫑 Pepper | Mar 15 | May 24 | Aug 2 |
| 🥔 Potato | — | Apr 26 | Jul 25 |
| 🌶️ Radish | — | Apr 12 | May 10 |
| 🍃 Spinach | — | Apr 5 | May 15 |
| 🎃 Summer Squash | Apr 19 | May 17 | Jul 6 |
| 🍅 Tomato | Mar 29 | May 17 | Jul 31 |
| 🥒 Zucchini | Apr 19 | May 17 | Jul 6 |