Ft Clatsop Natl Mem, OR Frost Dates & Growing Season

The two dates every Ft Clatsop Natl Mem garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 30
~50% chance of frost after
First fall frost
Nov 18
~50% chance of frost before
Growing season
233 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 26 Mar 30 Apr 28
First fall frost Dec 16 Nov 18 Oct 27
Hard freeze (28°F), median last Feb 12 · first Dec 13

Computed from NOAA 1991–2020 climate normals at the FT CLATSOP NATL MEM 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 Ft Clatsop Natl Mem

Computed from Ft Clatsop Natl Mem'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 Feb 2 – Feb 16 Apr 6 – Apr 13
🫑 Peppers Jan 19 – Feb 2 Apr 13 – Apr 20
🥬 Lettuce Feb 16 – Mar 2 Mar 2 – Mar 16 Mar 2 – Mar 30
🫛 Peas Feb 16 – Mar 2
🥕 Carrots Mar 9 – Mar 30
🥦 Broccoli Feb 9 – Feb 23 Mar 9 – Mar 23
🥬 Kale Feb 16 – Mar 2 Mar 2 – Mar 16 Mar 2 – Mar 16
🥒 Cucumbers Mar 2 – Mar 9 Apr 6 – Apr 13 Apr 6 – Apr 13
🥒 Zucchini Mar 2 – Mar 9 Apr 6 – Apr 13 Apr 6 – Apr 13
🫘 Green Beans (Bush) Apr 6 – Apr 13
🌽 Sweet Corn Apr 6 – Apr 13
🌿 Basil Feb 16 – Mar 2 Apr 6 – Apr 13 Apr 13 – Apr 20
🧄 Garlic Fall: Oct 7 – Nov 4

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 Ft Clatsop Natl Mem's dates automatically after a lookup.

Reading the season in Ft Clatsop Natl Mem

With roughly 233 frost-free days, Ft Clatsop Natl Mem 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 18 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Ft Clatsop Natl Mem, OR?

The average last spring frost in Ft Clatsop Natl Mem is around Mar 30, 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 Ft Clatsop Natl Mem, OR?

The average first fall frost in Ft Clatsop Natl Mem arrives around Nov 18. 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 Ft Clatsop Natl Mem?

About 233 frost-free days on average, from Mar 30 to Nov 18. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Ft Clatsop Natl Mem 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.