Autoflower Grow Calendar: When to Plant, Harvest, and Repeat Outdoors

Timing is everything when you’re following an autoflower grow calendar for outdoor plants. These fast-growing cannabis plants let you squeeze in more than one harvest per season—if you get the schedule right. This autoflower grow calendar will help you figure out when to plant, harvest, and start the next round like a pro.

For the full how-to on outdoor setups, check out our guide to growing autoflowers outdoors.

📅 Best Time to Plant: Outdoor Autoflower Grow Calendar

In most climates, your first outdoor autoflower run can start in late April or early May, once the threat of frost is gone and daytime temps consistently hit 60°F (15°C) or above.

First Planting Window: Late April – Early May

Expect to harvest your first crop 70–90 days later. That puts your first outdoor harvest around July.

🌞 Second Outdoor Autoflower Crop? Hell Yeah.

Thanks to their short life cycle, autoflowers let you run another full crop before fall hits—especially in warm regions.

Second Planting Window: Late June – Mid July

Harvest your second round by late September or early October—just before temps drop and light fades too far.

🧊 Fall Autoflower Grow Schedule: Is It Worth It?

Only if you live somewhere mild with long growing seasons (think SoCal, parts of the South, etc.). Otherwise, colder nights and weaker sun can slow growth and shrink yields.

But hey, if you’re using greenhouses or supplemental lighting, you’ve got more flexibility. Otherwise, aim for two outdoor runs max per year.

⏱ Autoflower Grow Calendar Overview

Late April – Early May: First outdoor crop starts
Late June – Mid July: Second crop begins
Late Sept – Early Oct: Final harvest (weather permitting)

Need strain recs? Here are some bangers: Top Autoflower Strains to Grow in 2025.

🌱 Pro Tip: Stagger Your Plantings

If you really want to maximize the season, stagger your seed starts every 2–3 weeks. That way you’re always harvesting something and not stuck waiting for one giant crop to finish.

Final Hit: When to Grow Autoflowers Outdoors

Autoflowers make it easy to grow weed outdoors—even easier to grow a lot of it. Use this calendar as your guide, start early, and take advantage of their speed. With the right timing, you’ll be trimming buds all season long.