USDA Zone 3a Planting Calendar (2026)
Zone 3a (-40 to -35°F) has an average last spring frost on May 15 and first fall frost on Sep 15 — about 123 growing days. Typical areas: northern Minnesota, International Falls.
| Vegetable | Start Indoors | Sow / Transplant | Harvest From |
|---|---|---|---|
| Beet | — | Apr 17 | Jun 11 |
| 🥦 Broccoli | Apr 10 | May 1 | Jul 5 |
| 🫘 Bush Beans | — | May 22 | Jul 16 |
| 🥬 Cabbage | Apr 3 | May 1 | Jul 20 |
| 🥕 Carrot | — | Apr 24 | Jul 3 |
| 🥦 Cauliflower | Apr 3 | May 1 | Jul 15 |
| 🌽 Corn | — | May 29 | Aug 17 |
| 🥒 Cucumber | Apr 24 | May 29 | Jul 23 |
| 🧄 Garlic | — | Oct 30 | Jun 27 |
| 🥬 Kale | Apr 10 | Apr 24 | Jun 18 |
| 🥬 Lettuce | Apr 17 | Apr 24 | Jun 8 |
| 🧅 Onion | Mar 6 | Apr 17 | Jul 26 |
| 🟢 Peas | — | Apr 3 | Jun 2 |
| 🫑 Pepper | Mar 20 | May 29 | Aug 7 |
| 🥔 Potato | — | May 1 | Jul 30 |
| 🌶️ Radish | — | Apr 17 | May 15 |
| 🍃 Spinach | — | Apr 10 | May 20 |
| 🎃 Summer Squash | Apr 24 | May 22 | Jul 11 |
| 🍅 Tomato | Apr 3 | May 22 | Aug 5 |
| 🥒 Zucchini | Apr 24 | May 22 | Jul 11 |