Last spring frost
May 25
Frost Dates for Baker City, OR
First fall frost
Sep 15
Growing season
111 days
Hardiness zone
6b
In an average year around Baker City, OR, the last spring frost (32°F) is about May 25 and the first fall frost is about Sep 15, giving roughly a 111-day growing season. To be safe most years, wait until May 9 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Freeze (32°F) | Jun 16 | May 25 | May 9 |
| Hard (28°F) | May 23 | May 8 | Apr 25 |
| Severe (24°F) | May 10 | Apr 26 | Apr 8 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Jun 16 | Jun 9 | Jun 4 | May 30 | May 25 | May 22 | May 17 | May 13 | May 9 |
| 28°F | May 23 | May 17 | May 13 | May 10 | May 8 | May 5 | May 3 | Apr 30 | Apr 25 |
| 24°F | May 10 | May 4 | May 1 | Apr 28 | Apr 26 | Apr 23 | Apr 19 | Apr 15 | Apr 8 |
| 20°F | Apr 28 | Apr 21 | Apr 16 | Apr 11 | Apr 6 | Apr 2 | Mar 28 | Mar 19 | Mar 9 |
| 16°F | Apr 6 | Mar 28 | Mar 16 | Mar 9 | Mar 4 | Feb 28 | Feb 25 | Feb 19 | Feb 12 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Freeze (32°F) | Sep 2 | Sep 15 | Oct 1 |
| Hard (28°F) | Sep 12 | Sep 27 | Oct 9 |
| Severe (24°F) | Sep 24 | Oct 7 | Oct 25 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Sep 2 | Sep 6 | Sep 9 | Sep 12 | Sep 15 | Sep 18 | Sep 21 | Sep 24 | Oct 1 |
| 28°F | Sep 12 | Sep 17 | Sep 21 | Sep 24 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 9 |
| 24°F | Sep 24 | Sep 29 | Oct 2 | Oct 5 | Oct 7 | Oct 11 | Oct 14 | Oct 19 | Oct 25 |
| 20°F | Oct 5 | Oct 10 | Oct 14 | Oct 18 | Oct 21 | Oct 25 | Oct 29 | Nov 2 | Nov 9 |
| 16°F | Oct 17 | Oct 23 | Oct 28 | Nov 1 | Nov 4 | Nov 9 | Nov 14 | Nov 21 | Nov 26 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Baker City Muni Ap, Or, about 3.4 miles away@if(!empty($station['elevation_ft'])), at 3,361 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Baker City, OR?
On average, the last spring frost (32°F) around Baker City, OR is about May 25. In cooler years it can run later, so for a safer bet many gardeners wait until May 9.
When is the first frost in the fall?
The first fall frost around Baker City, OR typically arrives about Sep 15. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around May 25 on average, or May 9 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 111 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 97814 Planting calendar → Oregon frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026