Zone 3 Planting Calendar

Zone 3 — Northern Minnesota, Montana, North Dakota

Last updated: May 15, 2026
Zone 3 Climate Facts
Last Spring Frost May 15
First Fall Frost Sep 15
Growing Season 123 days
Plants Available 38 varieties
Looking for your specific subzone?

Zone 3 is divided into two subzones. Select yours for more precise frost dates:

Zone 3a
Colder half
Last frost: May 22 · 109 days
Zone 3b
Warmer half
Last frost: May 8 · 137 days

All Plants for Zone 3

PlantTypeStart Indoors Transplant / SowHarvest StartHarvest End
Arugula vegetable — May 15 Jun 19 Jul 29
Asparagus vegetable Apr 24 May 22 year 2-3 ongoing
Basil herb May 1 May 29 Jul 25 Sep 12
Beet vegetable — May 15 Jul 13 Sep 1
Blueberry fruit Apr 24 May 22 year 2-3 ongoing
Broccoli vegetable Mar 27 May 15 Jul 21 Sep 12
Brussels Sprouts vegetable Mar 27 May 15 Aug 10 Sep 12
Butternut Squash vegetable May 8 Jun 5 Sep 5 Sep 12
Cabbage vegetable Mar 27 May 15 Jul 21 Sep 12
Carrot vegetable — May 22 Aug 5 Sep 12
Cauliflower vegetable Mar 27 May 15 Jul 16 Sep 9
Celery vegetable Apr 3 May 22 Sep 1 Sep 12
Chives herb Apr 24 May 22 Jul 31 Sep 12
Cilantro herb — May 22 Jul 16 Sep 9
Corn (Sweet) vegetable — May 29 Aug 5 Sep 12
Cucumber vegetable Apr 15 Jun 1 Jul 20 Sep 1
Dill herb — May 29 Jul 18 Sep 6
Garlic vegetable — Aug 4 Jul 14 Aug 13
Green Beans vegetable — May 29 Jul 25 Sep 8
Green Onion (Scallion) vegetable — May 15 Jul 14 Aug 28
Kale vegetable Mar 27 May 15 Jul 11 Sep 4
Lettuce vegetable Apr 17 May 15 Jun 20 Aug 19
Marigold flower Apr 17 Jun 5 Jul 27 Sep 12
Mint herb May 1 May 29 Aug 9 Sep 12
Onion vegetable Apr 17 May 15 Aug 23 Sep 12
Parsley herb Apr 3 May 22 Aug 21 Sep 12
Peas vegetable — May 15 Jul 19 Sep 2
Pepper (Bell) vegetable Mar 10 Jun 1 Aug 1 Sep 10
Potato vegetable Apr 24 May 22 Aug 17 Sep 12
Pumpkin vegetable May 8 Jun 5 Sep 10 Sep 12
Radish vegetable — May 15 Jun 11 Jul 24
Spinach vegetable Apr 17 May 15 Jun 28 Aug 12
Strawberry fruit Apr 24 May 22 Sep 10 Sep 12
Sunflower flower — May 29 Aug 17 Sep 12
Swiss Chard vegetable Apr 17 May 15 Jul 13 Aug 22
Tomato vegetable Mar 15 May 25 Jul 25 Sep 10
Turnip vegetable — May 15 Jun 19 Aug 18
Zucchini vegetable May 1 May 29 Jul 20 Sep 8
📚 Data Sources
Frost dates: NOAA Climate Normals 1991–2020, National Centers for Environmental Information.
Hardiness zones: USDA Plant Hardiness Zone Map, Agricultural Research Service.
Growing requirements: Cooperative Extension Services — NC State, Penn State, University of Florida IFAS.
Companion planting: Cornell University Cooperative Extension.
Data compiled from public agricultural sources. Always verify with your local extension office for micro-climate adjustments.