Zone 4a Planting Calendar

Zone 4a is the colder half of Zone 4. See also: Zone 4 full calendar

Last updated: May 15, 2026
Zone 4a Climate Facts
Last Spring FrostMay 17
First Fall FrostSep 18
Growing Season124 days
Plants Available40 varieties

All Plants for Zone 4a

PlantTypeStart IndoorsTransplant / SowHarvest StartHarvest End
Arugula vegetable — May 10 Jun 14 Jul 24
Asparagus vegetable Apr 19 May 17 year 2-3 ongoing
Basil herb Apr 26 May 24 Jul 20 Sep 13
Beet vegetable — May 10 Jul 8 Aug 27
Blueberry fruit Apr 19 May 17 year 2-3 ongoing
Broccoli vegetable Mar 22 May 10 Jul 16 Sep 14
Brussels Sprouts vegetable Mar 22 May 10 Aug 5 Sep 22
Butternut Squash vegetable May 3 May 31 Aug 31 Sep 22
Cabbage vegetable Mar 22 May 10 Jul 16 Sep 22
Cantaloupe fruit Apr 12 May 31 Aug 21 Sep 22
Carrot vegetable — May 17 Jul 31 Sep 19
Cauliflower vegetable Mar 22 May 10 Jul 11 Sep 4
Celery vegetable Mar 29 May 17 Aug 27 Sep 22
Chives herb Apr 19 May 17 Jul 26 Sep 22
Cilantro herb — May 17 Jul 11 Sep 4
Corn (Sweet) vegetable — May 24 Jul 31 Sep 22
Cucumber vegetable Apr 10 May 25 Jul 15 Sep 15
Dill herb — May 24 Jul 13 Sep 1
Garlic vegetable — Aug 14 Jul 9 Aug 8
Green Beans vegetable — May 24 Jul 20 Sep 3
Green Onion (Scallion) vegetable — May 10 Jul 9 Aug 23
Kale vegetable Mar 22 May 10 Jul 6 Aug 30
Lettuce vegetable Apr 12 May 10 Jun 15 Aug 14
Marigold flower Apr 12 May 31 Jul 22 Sep 10
Mint herb Apr 26 May 24 Aug 4 Sep 22
Onion vegetable Apr 12 May 10 Aug 18 Sep 22
Parsley herb Mar 29 May 17 Aug 16 Sep 22
Peas vegetable — May 10 Jul 14 Aug 28
Pepper (Bell) vegetable Mar 5 May 25 Jul 25 Sep 20
Potato vegetable Apr 19 May 17 Aug 12 Sep 22
Pumpkin vegetable May 3 May 31 Sep 5 Sep 22
Radish vegetable — May 10 Jun 6 Jul 19
Spinach vegetable Apr 12 May 10 Jun 23 Aug 7
Strawberry fruit Apr 19 May 17 Sep 5 Sep 22
Sunflower flower — May 24 Aug 12 Sep 22
Swiss Chard vegetable Apr 12 May 10 Jul 8 Aug 17
Tomato vegetable Mar 10 May 20 Jul 20 Sep 20
Turnip vegetable — May 10 Jun 14 Aug 13
Watermelon fruit Apr 19 Jun 7 Aug 24 Sep 22
Zucchini vegetable Apr 26 May 24 Jul 15 Sep 3
📚 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.