When to plant in La Grande, OR
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for La Grande, Oregon — all computed from La Grande's nearest NOAA weather station.
Zone 6b means La Grande sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
LA GRANDE · 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 La Grande’s own odds, recorded at LA GRANDE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 14 | May 26 | May 7 | Sep 3 | Sep 19 | Oct 3 |
| 32°F | May 26 | May 6 | Apr 21 | Sep 17 | Oct 1 | Oct 16 |
| 28°F | May 5 | Apr 19 | Apr 1 | Sep 30 | Oct 14 | Oct 29 |
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 La Grande, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 30 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.
La Grande planting FAQ
When is the last spring frost in La Grande, OR?
On average, the last spring frost in La Grande is around May 6 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in La Grande, OR?
Expect La Grande's first fall frost near October 1 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is La Grande in?
La Grande is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in La Grande?
There are roughly 148 frost-free days in La Grande (a short growing season), running from the average last frost around May 6 to the first fall frost near October 1.
When should I plant tomatoes in La Grande?
In La Grande, start tomato seeds indoors around March 11–March 25, then transplant seedlings outdoors around May 13 once the danger of frost has passed.
Never miss a window in La Grande
An email when it’s time to start seeds, transplant, and sow — timed to La Grande’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Baker City · 64 km
- Pendleton · 69 km
- Walla Walla · 85 km
- Hermiston · 109 km
- Kennewick · 129 km
- Pasco · 132 km
- Richland · 142 km
- Lewiston · 146 km
Frost dates recorded at LA GRANDE, 1 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 La Grande, OR — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00354622. Retrieved from https://blissgarden.com/oregon/la-grande.