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Lake Oswego, OR planting calendar

When to plant vegetables in Lake Oswego, OR (USDA hardiness zone 9a). Typical last spring frost around Mar 18, 2026 20 days year to year), first fall frost around Nov 18, 202617 days).

Playing it safe? Spring frost holds off until about Apr 12, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

Want exact dates for your address, a drag-and-drop bed layout, and reminders when it’s time to sow? Enter your ZIP:

Or get a printable Lake Oswego calendar and sowing reminders by email:

Still time to plant

As of today, these crops can still reach harvest before Lake Oswego, OR’s first frost (~Nov 18, 2026) — fastest first.

Month by month in Lake Oswego, OR

January

February

March

April

August

September

December

Understand your frost dates

Frost dates are NOAA 1991–2020 climate normals for a representative location in Lake Oswego, OR (covering 2 ZIPs); your exact dates depend on your address. Schedules are guidance, not guarantees.