Enterprise 20 NNE, OR Frost Dates & Growing Season

The two dates every Enterprise 20 NNE garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Jun 8
~50% chance of frost after
First fall frost
Sep 5
~50% chance of frost before
Growing season
89 days
frost-free stretch
USDA zone
≈ 6b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 18 Jun 8 Jul 8
First fall frost Sep 22 Sep 5 Aug 16
Hard freeze (28°F), median last May 13 · first Sep 22

Computed from NOAA 1991–2020 climate normals at the ENTERPRISE 20 NNE 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 Enterprise 20 NNE

Computed from Enterprise 20 NNE's own frost dates. Click any crop for the full zone-6 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Apr 13 – Apr 27 Jun 15 – Jun 22
🫑 Peppers Mar 30 – Apr 13 Jun 22 – Jun 29
🥬 Lettuce Apr 27 – May 11 May 11 – May 25 May 11 – Jun 8
🫛 Peas Apr 27 – May 11
🥕 Carrots May 18 – Jun 8
🥦 Broccoli Apr 20 – May 4 May 18 – Jun 1
🥬 Kale Apr 27 – May 11 May 11 – May 25 May 11 – May 25
🥒 Cucumbers May 11 – May 18 Jun 15 – Jun 22 Jun 15 – Jun 22
🥒 Zucchini May 11 – May 18 Jun 15 – Jun 22 Jun 15 – Jun 22
🫘 Green Beans (Bush) Jun 15 – Jun 22
🌽 Sweet Corn Jun 15 – Jun 22
🌿 Basil Apr 27 – May 11 Jun 15 – Jun 22 Jun 22 – Jun 29
🧄 Garlic Fall: Jul 25 – Aug 22

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 Enterprise 20 NNE's dates automatically after a lookup.

Reading the season in Enterprise 20 NNE

At about 89 frost-free days, Enterprise 20 NNE rewards efficiency: start warm-season crops indoors, favor short-season varieties, and lean on cold-tolerant crops — peas, kale, roots — that shrug off the shoulder-season frosts on either end.

Frequently asked questions

When is the last frost in Enterprise 20 NNE, OR?

The average last spring frost in Enterprise 20 NNE is around Jun 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 Enterprise 20 NNE, OR?

The average first fall frost in Enterprise 20 NNE arrives around Sep 5. 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 Enterprise 20 NNE?

About 89 frost-free days on average, from Jun 8 to Sep 5. That favors short-season varieties and transplants for warm-season crops, with cool-season vegetables doing the heavy lifting in spring and fall.

What USDA zone is Enterprise 20 NNE in?

USDA zone 6b 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.