When to plant in Meridian, ID
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Meridian, Idaho — is derived from the closest NOAA station with complete climate normals.
Zone 7a means many perennials and even some tender shrubs overwinter in Meridian, while your frost dates still decide when annuals go out.
The average last spring frost in Meridian is now 6 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
BOISE AIR TERMINAL · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Meridian’s own odds, recorded at BOISE AIR TERMINAL.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 8 | Apr 23 | Sep 25 | Oct 8 | Oct 25 |
| 32°F | May 9 | Apr 24 | Apr 4 | Oct 5 | Oct 21 | Nov 5 |
| 28°F | Apr 25 | Apr 2 | Mar 10 | Oct 17 | Oct 31 | Nov 19 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Meridian, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Meridian planting FAQ
When is the last spring frost in Meridian, ID?
Plan for the last spring frost in Meridian around April 24 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Meridian, ID?
In Meridian, the first 32°F freeze of fall lands around October 21 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Meridian in?
Meridian is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Meridian?
There are roughly 180 frost-free days in Meridian (a moderate growing season), running from the average last frost around April 24 to the first fall frost near October 21.
When should I plant tomatoes in Meridian?
In Meridian, start tomato seeds indoors around February 27–March 13, then transplant seedlings outdoors around May 1 once the danger of frost has passed.
Never miss a window in Meridian
An email when it’s time to start seeds, transplant, and sow — timed to Meridian’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Kuna · 10 km
- Eagle · 10 km
- Garden City · 11 km
- Star · 13 km
- Nampa · 13 km
- Boise City · 14 km
- Middleton · 20 km
- Caldwell · 21 km
Frost dates recorded at BOISE AIR TERMINAL, 14 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Meridian, ID — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024131. Retrieved from https://blissgarden.com/idaho/meridian.