Seattle Sand Pt WSFO, WA Frost Dates & Growing Season

The two dates every Seattle Sand Pt WSFO garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 8
~50% chance of frost after
First fall frost
Nov 23
~50% chance of frost before
Growing season
260 days
frost-free stretch
USDA zone
≈ 9a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Feb 13 Mar 8 Mar 29
First fall frost Dec 16 Nov 23 Nov 4
Hard freeze (28°F), median last Feb 11 · first Dec 11

Computed from NOAA 1991–2020 climate normals at the SEATTLE SAND PT WSFO station. "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Seattle Sand Pt WSFO

Computed from Seattle Sand Pt WSFO's own frost dates. Click any crop for the full zone-9 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Jan 11 – Jan 25 Mar 15 – Mar 22
🫑 Peppers Dec 28 – Jan 11 Mar 22 – Mar 29
🥬 Lettuce Jan 25 – Feb 8 Feb 8 – Feb 22 Feb 8 – Mar 8
🫛 Peas Jan 25 – Feb 8
🥕 Carrots Feb 15 – Mar 8
🥦 Broccoli Jan 18 – Feb 1 Feb 15 – Mar 1
🥬 Kale Jan 25 – Feb 8 Feb 8 – Feb 22 Feb 8 – Feb 22
🥒 Cucumbers Feb 8 – Feb 15 Mar 15 – Mar 22 Mar 15 – Mar 22
🥒 Zucchini Feb 8 – Feb 15 Mar 15 – Mar 22 Mar 15 – Mar 22
🫘 Green Beans (Bush) Mar 15 – Mar 22
🌽 Sweet Corn Mar 15 – Mar 22
🌿 Basil Jan 25 – Feb 8 Mar 15 – Mar 22 Mar 22 – Mar 29
🧄 Garlic Fall: Oct 12 – Nov 9

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Seattle Sand Pt WSFO's dates automatically after a lookup.

Reading the season in Seattle Sand Pt WSFO

With roughly 260 frost-free days, Seattle Sand Pt WSFO gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Nov 23 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Seattle Sand Pt WSFO, WA?

The average last spring frost in Seattle Sand Pt WSFO is around Mar 8, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Seattle Sand Pt WSFO, WA?

The average first fall frost in Seattle Sand Pt WSFO arrives around Nov 23. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Seattle Sand Pt WSFO?

About 260 frost-free days on average, from Mar 8 to Nov 23. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Seattle Sand Pt WSFO in?

USDA zone 9a on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.