La Grande, OR frost dates
Last spring frostMay 6median date
First fall frostOct 1median date
Growing season148 daysfrost-free
Hardiness zone6bZone 6b
How La Grande compares
- In 8 years out of 10, the last spring frost in La Grande falls between April 21 and May 26, a 35-day window. The first fall frost falls between September 17 and October 16.
- The median last frost is 20 days later than the Oregon median of Apr 16.
- Its 148-day growing season is longer than 23% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 14 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 136 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 21 |
| 50% (median) | May 6 |
| 10% (safe for tender plants) | May 26 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 17 |
| 50% (median) | October 1 |
| 90% (late) | October 16 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for La Grande, OR
La Grande, OR frost dates — last frost May 6, first frost Oct 1, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Feb 11 to Feb 25Transplant outside: Apr 8 to Apr 22
Start indoors: Feb 25 to Mar 11Transplant outside: May 20 to Jun 3
Start indoors: Feb 25 to Mar 11Transplant outside: May 20 to Jun 3
Start indoors: Mar 11 to Mar 25Transplant outside: May 13 to May 27
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 15 to Apr 29Sow outdoors: Apr 8 to May 13Plant for fall: Aug 6 to Sep 3
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 8 to Apr 22Sow outdoors: Apr 8 to Apr 22Plant for fall: Jul 23 to Aug 13
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 22 to May 6Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 15 to Apr 29Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 22 to May 6Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 25 to Apr 8Transplant outside: May 27 to Jun 10Sow outdoors: May 27 to Jun 10
Start indoors: Mar 25 to Apr 8Transplant outside: May 13 to May 27
Sow outdoors: Mar 25 to Apr 15Plant for fall: Jul 9 to Jul 30
Sow outdoors: Mar 25 to Apr 15Plant for fall: Aug 6 to Aug 27
Sow outdoors: Apr 1 to May 13Plant for fall: Aug 20 to Sep 10
Start indoors: Apr 8 to Apr 15Transplant outside: May 20 to May 27Sow outdoors: May 13 to May 27Plant for fall: Jul 16 to Jul 30
Start indoors: Apr 8 to Apr 15Sow outdoors: May 13 to May 27Plant for fall: Jul 23 to Aug 6
Start indoors: Apr 8 to Apr 15Sow outdoors: May 13 to May 27
Start indoors: Apr 8 to Apr 15Transplant outside: May 20 to Jun 3
Sow outdoors: Apr 15 to May 13Plant for fall: Jul 9 to Jul 23
Sow outdoors: Apr 15 to May 13Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 15 to May 6
Sow outdoors: Apr 22 to May 20Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 22 to May 13Plant for fall: Aug 6 to Aug 27
Sow outdoors: May 13 to Jun 3Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 13 to May 27
Transplant outside: May 20 to Jun 10
Plant for fall: Sep 17 to Oct 22
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in La Grande, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 11 – Feb 25 | Apr 8 – Apr 22 | — | — |
| Peppers | Feb 25 – Mar 11 | May 20 – Jun 3 | — | — |
| Eggplant | Feb 25 – Mar 11 | May 20 – Jun 3 | — | — |
| Tomatoes | Mar 11 – Mar 25 | May 13 – May 27 | — | — |
| Lettuce | Mar 11 – Mar 25 | Apr 15 – Apr 29 | Apr 8 – May 13 | Aug 6 – Sep 3 |
| Kale | Mar 11 – Mar 25 | Apr 8 – Apr 22 | Apr 8 – Apr 22 | Jul 23 – Aug 13 |
| Broccoli | Mar 11 – Mar 25 | Apr 22 – May 6 | — | Jun 25 – Jul 16 |
| Cabbage | Mar 11 – Mar 25 | Apr 15 – Apr 29 | — | Jun 25 – Jul 16 |
| Cauliflower | Mar 11 – Mar 25 | Apr 22 – May 6 | — | Jun 25 – Jul 16 |
| Okra | Mar 25 – Apr 8 | May 27 – Jun 10 | May 27 – Jun 10 | — |
| Basil | Mar 25 – Apr 8 | May 13 – May 27 | — | — |
| Peas | — | — | Mar 25 – Apr 15 | Jul 9 – Jul 30 |
| Spinach | — | — | Mar 25 – Apr 15 | Aug 6 – Aug 27 |
| Radishes | — | — | Apr 1 – May 13 | Aug 20 – Sep 10 |
| Cucumbers | Apr 8 – Apr 15 | May 20 – May 27 | May 13 – May 27 | Jul 16 – Jul 30 |
| Zucchini & Summer Squash | Apr 8 – Apr 15 | — | May 13 – May 27 | Jul 23 – Aug 6 |
| Winter Squash & Pumpkins | Apr 8 – Apr 15 | — | May 13 – May 27 | — |
| Melons & Watermelon | Apr 8 – Apr 15 | May 20 – Jun 3 | — | — |
| Carrots | — | — | Apr 15 – May 13 | Jul 9 – Jul 23 |
| Beets | — | — | Apr 15 – May 13 | Jul 23 – Aug 6 |
| Potatoes | — | — | Apr 15 – May 6 | — |
| Swiss Chard | — | — | Apr 22 – May 20 | Jul 23 – Aug 6 |
| Cilantro | — | — | Apr 22 – May 13 | Aug 6 – Aug 27 |
| Green Beans | — | — | May 13 – Jun 3 | Jul 16 – Jul 30 |
| Sweet Corn | — | — | May 13 – May 27 | — |
| Sweet Potatoes | — | May 20 – Jun 10 | — | — |
| Garlic | — | — | — | Sep 17 – Oct 22 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the La Grande, OR weather station, 2 km away (elevation 2,756 ft (840 m)).
Frost dates near La Grande
- Imbler May 24 · Sep 18
- Summerville May 24 · Sep 18
- Cove May 11 · Sep 26
- Union May 11 · Sep 26
- Elgin May 24 · Sep 18
- Meacham frost any month
- North Powder May 11 · Sep 26
- Wallowa Jun 7 · Sep 9
- Haines May 25 · Sep 15
- Lostine Jun 7 · Sep 9
Frequently asked questions
When is the last frost in La Grande, OR?
The median last spring frost in La Grande, OR is May 6. There is still about a 10% chance of frost after May 26, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in La Grande, OR?
The median first fall frost is October 1, with about a 10% chance of frost before September 17.
How long is the growing season in La Grande, OR?
About 148 days between the median last spring frost and first fall frost.
What planting zone is La Grande, OR?
La Grande, OR is in USDA hardiness zone 6b.