Seattle in July: what to plant
Over the last 5 years, July in Seattle has run 14.6–25.2°C with about 10 mm of rain across the month. Here is what weather like that will carry to harvest.
Everything above is a five-year average. In the game it is this — the weather Seattle is actually having, today.
Grow one in Seattle's weather right now →❄️ No sub-zero nights in July in the last 5 years — frost is not the limiting factor here.
🗓️ This month sits inside the frost-free window. Average last spring frost around Mar 1, first autumn frost around Dec 9 — roughly 283 frost-free days. Sow tender crops after the last frost date and make sure they finish before the first.
☀️ About 13.1 h of sunshine a day this month. Within the month it warms by about 1.0°C from the first ten days to the last.
Sow this month — when would you harvest?
Assuming you sow in mid-July, then adding up the warmth Seattle usually gets, one day at a time — which is why some of these run past the end of the month.
| Crop | Days | Harvest around |
|---|---|---|
| 🥒 Zucchini | 70 | Sep 22 |
| 🥢 Green Beans | 62 | Sep 14 |
| 🌿 Amaranth greens | 56 | Sep 8 |
| 🌻 Sunflower | 119 | Nov 10 |
| 🏵️ Marigold | 46 | Aug 29 |
| 🥔 Potato | 74 | Sep 26 |
| 🌿 Garlic chives | 57 | Sep 9 |
| 🥬 Celery | 102 | Oct 24 |
| 🧅 Onion | 74 | Sep 26 |
| 🥬 Bok Choy | 30 | Aug 13 |
⏳ Too late this month: Cucumber, Sweet Corn would still be in the ground when the first frost arrives (around Dec 9). Sow them earlier in the year, or grow them under cover.
🌡️ Luffa, Winter melon, Aubergine, Okra never accumulate enough heat outdoors in Seattle — not in any month. Locally these need a greenhouse or a warm windowsill.
Best crops to sow now
They are all ideal for this month — the only real difference is how long each one takes, so pick whatever you want to eat.
- 🥒 Cucumber about 108 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🌽 Sweet Corn about 91 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🥒 Zucchini about 66 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🥢 Green Beans about 61 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🌿 Amaranth greens about 56 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🌻 Sunflower about 85 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🏵️ Marigold about 47 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🥔 Potato about 70 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🌿 Garlic chives about 58 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🥬 Celery about 87 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🧅 Onion about 71 days to harvest Recent mean 19.9°C — right in the sweet spot
- 🥬 Bok Choy about 31 days to harvest Recent mean 19.9°C — right in the sweet spot
Leave these for another month
- 🌿 Rocket — 26 day(s) of heat stress
- 🌿 Spinach — 18 day(s) of heat stress
- 🌿 Coriander — 9 day(s) of heat stress
Other months in Seattle
📍 Somewhere else? Look up your own city →
Temperature and rainfall come from Open-Meteo's historical observations for Seattle, averaged day by day over the last 5 years. Whether a crop finishes in time is worked out from its own starting temperature and heat requirement — those numbers are listed on each crop page if you want to check them.