Bridgeport, OR frost dates
Last spring frostMay 25median date
First fall frostSep 15median date
Growing season113 daysfrost-free
Hardiness zone6bZone 6b
How Bridgeport compares
- In 8 years out of 10, the last spring frost in Bridgeport falls between May 9 and June 16, a 38-day window. The first fall frost falls between September 2 and October 1.
- The median last frost is 39 days later than the Oregon median of Apr 16.
- Its 113-day growing season is longer than 9% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 33 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 191 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 9 |
| 50% (median) | May 25 |
| 10% (safe for tender plants) | June 16 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 2 |
| 50% (median) | September 15 |
| 90% (late) | October 1 |
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 Bridgeport, OR
Bridgeport, OR frost dates — last frost May 25, first frost Sep 15, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Mar 2 to Mar 16Transplant outside: Apr 27 to May 11
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Sow outdoors: Apr 27 to Jun 1Plant for fall: Jul 21 to Aug 18
Start indoors: Mar 30 to Apr 13Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 9 to Jun 30
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Plant for fall: Jun 9 to Jun 30
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 9 to Jun 30
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 15 to Jun 29Sow outdoors: Jun 15 to Jun 29
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 1 to Jun 15
Sow outdoors: Apr 13 to May 4Plant for fall: Jun 23 to Jul 14
Sow outdoors: Apr 13 to May 4Plant for fall: Jul 21 to Aug 11
Sow outdoors: Apr 20 to Jun 1Plant for fall: Aug 4 to Aug 25
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 15Sow outdoors: Jun 1 to Jun 15Plant for fall: Jun 30 to Jul 14
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15Plant for fall: Jul 7 to Jul 21
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 22
Sow outdoors: May 4 to Jun 1Plant for fall: Jun 23 to Jul 7
Sow outdoors: May 4 to Jun 1Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 4 to May 25
Sow outdoors: May 11 to Jun 8Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 11 to Jun 1Plant for fall: Jul 21 to Aug 11
Sow outdoors: Jun 1 to Jun 22
Sow outdoors: Jun 1 to Jun 15
Transplant outside: Jun 8 to Jun 29
Plant for fall: Sep 1 to Oct 6
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Bridgeport, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 2 – Mar 16 | Apr 27 – May 11 | — | — |
| Peppers | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Eggplant | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Tomatoes | Mar 30 – Apr 13 | Jun 1 – Jun 15 | — | — |
| Lettuce | Mar 30 – Apr 13 | May 4 – May 18 | Apr 27 – Jun 1 | Jul 21 – Aug 18 |
| Kale | Mar 30 – Apr 13 | Apr 27 – May 11 | Apr 27 – May 11 | Jul 7 – Jul 28 |
| Broccoli | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 9 – Jun 30 |
| Cabbage | Mar 30 – Apr 13 | May 4 – May 18 | — | Jun 9 – Jun 30 |
| Cauliflower | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 9 – Jun 30 |
| Okra | Apr 13 – Apr 27 | Jun 15 – Jun 29 | Jun 15 – Jun 29 | — |
| Basil | Apr 13 – Apr 27 | Jun 1 – Jun 15 | — | — |
| Peas | — | — | Apr 13 – May 4 | Jun 23 – Jul 14 |
| Spinach | — | — | Apr 13 – May 4 | Jul 21 – Aug 11 |
| Radishes | — | — | Apr 20 – Jun 1 | Aug 4 – Aug 25 |
| Cucumbers | Apr 27 – May 4 | Jun 8 – Jun 15 | Jun 1 – Jun 15 | Jun 30 – Jul 14 |
| Zucchini & Summer Squash | Apr 27 – May 4 | — | Jun 1 – Jun 15 | Jul 7 – Jul 21 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 113 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | Apr 27 – May 4 | — | Jun 1 – Jun 15 | — |
| Melons & Watermelon | Apr 27 – May 4 | Jun 8 – Jun 22 | — | — |
| Carrots | — | — | May 4 – Jun 1 | Jun 23 – Jul 7 |
| Beets | — | — | May 4 – Jun 1 | Jul 7 – Jul 21 |
| Potatoes | — | — | May 4 – May 25 | — |
| Swiss Chard | — | — | May 11 – Jun 8 | Jul 7 – Jul 21 |
| Cilantro | — | — | May 11 – Jun 1 | Jul 21 – Aug 11 |
| Green Beans | — | — | Jun 1 – Jun 22 | — |
| Sweet Corn | — | — | Jun 1 – Jun 15 | — |
| Sweet Potatoes Warning: Your frost-free season is about 113 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 8 – Jun 29 | — | — |
| Garlic | — | — | — | Sep 1 – Oct 6 |
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 Baker City Muni Ap, OR weather station, 39 km away (elevation 3,360 ft (1,024 m)).
Frost dates near Bridgeport
- Hereford frost any month
- Ironside May 7 · Oct 3
- Durkee Apr 23 · Oct 13
- Baker City May 25 · Sep 15
- Unity frost any month
- Brogan May 7 · Oct 3
- Jamieson Apr 23 · Oct 13
- Huntington Apr 23 · Oct 13
- Sumpter frost any month
- Haines May 25 · Sep 15
Frequently asked questions
When is the last frost in Bridgeport, OR?
The median last spring frost in Bridgeport, OR is May 25. There is still about a 10% chance of frost after June 16, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Bridgeport, OR?
The median first fall frost is September 15, with about a 10% chance of frost before September 2.
How long is the growing season in Bridgeport, OR?
About 113 days between the median last spring frost and first fall frost.
What planting zone is Bridgeport, OR?
Bridgeport, OR is in USDA hardiness zone 6b.