Fairfield Rs, ID Frost Dates & Growing Season

The two dates every Fairfield Rs 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 14
~50% chance of frost before
Growing season
98 days
frost-free stretch
USDA zone
≈ 5b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost May 15 Jun 8 Jun 28
First fall frost Sep 28 Sep 14 Aug 29
Hard freeze (28°F), median last May 11 · first Sep 28

Computed from NOAA 1991–2020 climate normals at the FAIRFIELD RS 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 Fairfield Rs

Computed from Fairfield Rs's own frost dates. Click any crop for the full zone-5 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: Aug 3 – Aug 31

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 Fairfield Rs's dates automatically after a lookup.

Reading the season in Fairfield Rs

At about 98 frost-free days, Fairfield Rs 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 Fairfield Rs, ID?

The average last spring frost in Fairfield Rs 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 Fairfield Rs, ID?

The average first fall frost in Fairfield Rs arrives around Sep 14. 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 Fairfield Rs?

About 98 frost-free days on average, from Jun 8 to Sep 14. 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 Fairfield Rs in?

USDA zone 5b 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.