Frost Dates for Pocatello, ID 83201

Last spring frost May 23 · First fall frost September 18 · 118 frost-free days · USDA Zone 6b

Frost probability for 83201

Frost10%50%90%
Spring (last frost)June 11May 23May 3
Fall (first frost)September 4September 18October 1

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (15.8 km away); the 50% date is the median year.

Frost dates by ZIP code in Pocatello, ID

ZIPLast spring frost (50%)First fall frost (50%)Zone
83201May 23September 186b
83202May 28September 186a
83204May 30September 176a
83209May 23September 186a

Month by month in Pocatello

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost).
MarchStart peppers and eggplant indoors 8–10 weeks before your last frost (around May 23). Start tomatoes about two weeks later, 6–8 weeks before last frost.
AprilStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
MayLast frost around May 23. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
JuneFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JulySuccession plant lettuce and greens. Keep beds weeded and watered consistently.
AugustFirst fall frost approaching (around September 18). Transplant fall brassicas. Sow spinach, arugula, and radishes.
SeptemberFirst frost around September 18. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
OctoberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.
NovemberClean up spent plants. Add compost to beds. Rest, review, and plan next year's garden.
DecemberClean up spent plants. Add compost to beds. Rest, review, and plan next year's garden.

What grows in a 118-day season

Frequently Asked Questions

What is the last frost date for Pocatello, ID (ZIP 83201)?

The median last spring frost date for Pocatello, ID (ZIP code 83201) is around May 23. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in Pocatello, ID?

The median first fall frost date for Pocatello, ID is around September 18. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in Pocatello, ID?

The frost-free growing season in Pocatello is about 118 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is Pocatello, ID?

Based on frost date patterns, Pocatello falls approximately in 6b. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in Pocatello, ID?

Start tomato seeds indoors 6–8 weeks before your last frost date (around May 23). For Pocatello, that's roughly March 28 to April 11. Transplant outdoors 1–2 weeks after your last frost.

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