Zone 1a planting calendar
What to plant in August: zone 1a
Zone 1a averages its last spring frost around June 20 and its first fall frost around August 10. Everything below is timed from those two dates, so it stays useful whether you're planting for summer or for a fall harvest.
Last frost: June 20
First frost: August 10
Winter lows: -60 to -55 °F
Garden care
- Side-dress heavy feedersaround Aug 1
Tomatoes, peppers, corn and squash get compost or fish emulsion once fruit sets.
- Prune and stake tomatoesaround Aug 8
Pull suckers and lower leaves for airflow. The main defense against blight in humid heat.
- Shade the cool-season bedaround Aug 15
30-40% shade cloth keeps lettuce, cilantro and spinach from bolting in peak heat.
- Scout for pests weeklyaround Aug 22
Squash bugs, hornworms and cucumber beetles peak now: five minutes of hand-picking beats a rescue spray.
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