Last and first frost dates in Olympia

When is the last frost in Olympia?

The last frost in Olympia usually comes around 19 March: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 26 February, while corn waits until 10 May. The first autumn frost follows around 15 November, about 241 days later: harvest or cover frost-tender crops before then.

When to sow and plant

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

When the soil warms up in Olympia

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 37 days after the last spring frost and 15 °C 73 days after it.

Frost dates near Olympia

Of the nearest cities on our list, the last spring frost ends earliest in Victoria (1 March) and latest in Yakima (13 April).

Seeds, seedlings and markets in Olympia

Within 15 km of Olympia OpenStreetMap lists 5 garden centres, 1 plant nursery, 2 markets and 2 farm shops (collected 28 October 2026). The nearest garden centre to the city centre is Underhill Plants, 1 km away.

• Underhill Plants — garden centre
  Mon–Tue closed; Wed–Fri 11:00–17:00; Sat–Sun 10:00–17:00 · 1 km
• Olympia Farmers Market — market
  N Captiol Way 700, 98501 Olympia · Jan–Mar: Sat 10:00–15:00; Apr–Oct: Thu–Sun 10:00–15:00; Nov–Dec: Sat, Sun 10:00–15:00 · 1 km · olympiafarmersmarket.com
• Ladyberry Produce — farm shop
  Zangle Road Northeast 8038, 98506 Olympia · 12 km
• Eastside Urban Farm & Garden Center — garden centre
  4th Avenue East 2326, 98506 Olympia · Mon–Sat 10:00–17:30; Sun 12:00–17:00 · 3 km · urbanfarmoly.com
• Bark & Garden Center — garden centre
  Mon–Sun 09:00–17:00 · 4 km
• Hefty Harvest — garden centre
  Mon–Sun 10:00–18:00 · 4 km

• Where to buy seeds and seedlings in Olympia
• Selling your own harvest in the United States

Places: © OpenStreetMap contributors, ODbL.

Weather in Olympia by month

Average weather in Olympia over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June–September (21.9–26.7 °C). No month averages below 0 °C at night; the coldest nights, in February, average 1.5 °C. About 1416 mm of rain falls in a year, on 154 days; December is the wettest month (227 mm) and July the driest (11 mm).

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).