How long is the growing season in Zone 1a?

Zone 1a has an average growing season of 30 frost-free days.

Zone 1a Planting Schedule

Q: What are the frost dates for Zone 1a?

In Zone 1a, the average last spring frost is Jun 15th and the average first fall frost is Jul 15th.

Q: When is the best time to start seeds indoors in Zone 1a?

In Zone 1a, start seeds indoors 6–8 weeks before your average last spring frost (around Jun 15th). The exact timing varies by crop — check the planting schedule above for crop-specific indoor seed start dates.

Last spring frost: Jun 15th

First fall frost: Jul 15th

Growing season: 30 days

All Zones Zone 1a Save Garden

Action Plan: August in Zone 1a

Expert Note

August in Zone 1a is short-season and heat can spike fast. Keep soil evenly moist, mulch to reduce evaporation, and watch for aphids and flea beetles on young growth; use row cover early and remove it once plants flower.

Seed & Soil

Direct sow quick, cold-tolerant greens and brassicas while you still have warm soil: Bibb, Frisee, Broccoli, and Radish. If you have space, transplant or start Brussels Sprout for a late-season harvest window.

The Harvest

Harvest regularly from your cool-season stand: Bibb, Frisee, Radish, and Broccoli. Pick in the morning, keep leaves cool, and remove any yellowing foliage to reduce pest pressure.

Planting Schedule

Add crops from the list below to build your planting schedule.

Crop	Indoor Start	Transplant / Sow	Harvest Window
Aureus	Apr 20th	Aug 3rd	Oct 2nd – Jul 15th
Barbeque	Apr 20th	Aug 3rd	Nov 1st – Jul 15th
Blue Hyssop	May 11th	Aug 3rd	Oct 17th – Jul 15th
Clove Basil	May 4th	Aug 3rd	Oct 2nd – Jul 15th
Dark Green Italian Plain	May 18th	Aug 3rd	Oct 12th – Jul 15th
Elfin Thyme	May 4th	Aug 3rd	Dec 1st – Jul 15th
Mammoth	May 18th	Aug 3rd	Sep 27th – Jul 15th
Mammoth Basil	May 18th	Aug 3rd	Oct 2nd – Jul 15th
Pesto Perpetuo	May 4th	Aug 3rd	Sep 12th – Jul 15th
Red Holy Basil	May 4th	Aug 3rd	Oct 2nd – Jul 15th
Beefmaster	Apr 20th	Aug 10th	Nov 8th – Jul 15th
Beefsteak	Apr 27th	Aug 10th	Nov 8th – Jul 15th
Bluejay	Direct Sow	Aug 10th	Oct 9th – Jul 15th
Catanese	Apr 6th	Aug 10th	Dec 8th – Jul 15th
Craig's Grande	Apr 20th	Aug 10th	Oct 24th – Jul 15th
Dark Opal	May 4th	Aug 10th	Oct 9th – Jul 15th
Datil	Apr 27th	Aug 10th	Nov 8th – Jul 15th
Esopus Spitzenburg	Direct Sow	Aug 10th	Jan 27th – Jul 15th
Evolvulus	Direct Sow	Aug 10th	Oct 24th – Jul 15th
Felix	Apr 20th	Aug 10th	Oct 24th – Jul 15th
Femminello	Direct Sow	Aug 10th	Apr 7th – Jul 15th
Fuji	Direct Sow	Aug 10th	Nov 8th – Jul 15th
Goliath	Apr 27th	Aug 10th	Nov 8th – Jul 15th
Goliath Goldrush	Apr 27th	Aug 10th	Nov 8th – Jul 15th
Goliath Original	Apr 20th	Aug 10th	Nov 8th – Jul 15th
Green Twister	Apr 20th	Aug 10th	Oct 19th – Jul 15th
Gros Bleu	Apr 20th	Aug 10th	Aug 10th – Jul 15th
Hardy Marjoram	May 18th	Aug 10th	Oct 9th – Jul 15th
Hill Hardy	May 4th	Aug 10th	Dec 8th – Jul 15th
Italian	May 18th	Aug 10th	Nov 8th – Jul 15th

Frequently Asked Questions

What are the frost dates for Zone Zone 1a?

In Zone Zone 1a, the average last spring frost is Jun 15th and the average first fall frost is Jul 15th.

When is the best time to start seeds indoors in Zone Zone 1a?

The best time to start most seeds indoors is 6 to 8 weeks before your last spring frost date of Jun 15th.

How long is the growing season in Zone Zone 1a?

Zone Zone 1a has a growing season of approximately 30 days.