Bonanza, OR frost dates
Last spring frostMay 31median date
First fall frostSep 21median date
Growing season113 daysfrost-free
Hardiness zone6bZone 6b
How Bonanza compares
- In 8 years out of 10, the last spring frost in Bonanza falls between May 7 and June 17, a 41-day window. The first fall frost falls between September 6 and October 4.
- The median last frost is 45 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 39 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 7 |
| 50% (median) | May 31 |
| 10% (safe for tender plants) | June 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 6 |
| 50% (median) | September 21 |
| 90% (late) | October 4 |
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 Bonanza, OR
Bonanza, OR frost dates — last frost May 31, first frost Sep 21, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Mar 8 to Mar 22Transplant outside: May 3 to May 17
Start indoors: Mar 22 to Apr 5Transplant outside: Jun 14 to Jun 28
Start indoors: Mar 22 to Apr 5Transplant outside: Jun 14 to Jun 28
Start indoors: Apr 5 to Apr 19Transplant outside: Jun 7 to Jun 21
Start indoors: Apr 5 to Apr 19Transplant outside: May 10 to May 24Sow outdoors: May 3 to Jun 7Plant for fall: Jul 27 to Aug 24
Start indoors: Apr 5 to Apr 19Transplant outside: May 3 to May 17Sow outdoors: May 3 to May 17Plant for fall: Jul 13 to Aug 3
Start indoors: Apr 5 to Apr 19Transplant outside: May 17 to May 31Plant for fall: Jun 15 to Jul 6
Start indoors: Apr 5 to Apr 19Transplant outside: May 10 to May 24Plant for fall: Jun 15 to Jul 6
Start indoors: Apr 5 to Apr 19Transplant outside: May 17 to May 31Plant for fall: Jun 15 to Jul 6
Start indoors: Apr 19 to May 3Transplant outside: Jun 21 to Jul 5Sow outdoors: Jun 21 to Jul 5
Start indoors: Apr 19 to May 3Transplant outside: Jun 7 to Jun 21
Sow outdoors: Apr 19 to May 10Plant for fall: Jun 29 to Jul 20
Sow outdoors: Apr 19 to May 10Plant for fall: Jul 27 to Aug 17
Sow outdoors: Apr 26 to Jun 7Plant for fall: Aug 10 to Aug 31
Start indoors: May 3 to May 10Transplant outside: Jun 14 to Jun 21Sow outdoors: Jun 7 to Jun 21Plant for fall: Jul 6 to Jul 20
Start indoors: May 3 to May 10Sow outdoors: Jun 7 to Jun 21Plant for fall: Jul 13 to Jul 27
Start indoors: May 3 to May 10Sow outdoors: Jun 7 to Jun 21
Start indoors: May 3 to May 10Transplant outside: Jun 14 to Jun 28
Sow outdoors: May 10 to Jun 7Plant for fall: Jun 29 to Jul 13
Sow outdoors: May 10 to Jun 7Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 10 to May 31
Sow outdoors: May 17 to Jun 14Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 17 to Jun 7Plant for fall: Jul 27 to Aug 17
Sow outdoors: Jun 7 to Jun 28
Sow outdoors: Jun 7 to Jun 21
Transplant outside: Jun 14 to Jul 5
Plant for fall: Sep 7 to Oct 12
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Bonanza, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 8 – Mar 22 | May 3 – May 17 | — | — |
| Peppers | Mar 22 – Apr 5 | Jun 14 – Jun 28 | — | — |
| Eggplant | Mar 22 – Apr 5 | Jun 14 – Jun 28 | — | — |
| Tomatoes | Apr 5 – Apr 19 | Jun 7 – Jun 21 | — | — |
| Lettuce | Apr 5 – Apr 19 | May 10 – May 24 | May 3 – Jun 7 | Jul 27 – Aug 24 |
| Kale | Apr 5 – Apr 19 | May 3 – May 17 | May 3 – May 17 | Jul 13 – Aug 3 |
| Broccoli | Apr 5 – Apr 19 | May 17 – May 31 | — | Jun 15 – Jul 6 |
| Cabbage | Apr 5 – Apr 19 | May 10 – May 24 | — | Jun 15 – Jul 6 |
| Cauliflower | Apr 5 – Apr 19 | May 17 – May 31 | — | Jun 15 – Jul 6 |
| Okra | Apr 19 – May 3 | Jun 21 – Jul 5 | Jun 21 – Jul 5 | — |
| Basil | Apr 19 – May 3 | Jun 7 – Jun 21 | — | — |
| Peas | — | — | Apr 19 – May 10 | Jun 29 – Jul 20 |
| Spinach | — | — | Apr 19 – May 10 | Jul 27 – Aug 17 |
| Radishes | — | — | Apr 26 – Jun 7 | Aug 10 – Aug 31 |
| Cucumbers | May 3 – May 10 | Jun 14 – Jun 21 | Jun 7 – Jun 21 | Jul 6 – Jul 20 |
| Zucchini & Summer Squash | May 3 – May 10 | — | Jun 7 – Jun 21 | Jul 13 – Jul 27 |
| 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. | May 3 – May 10 | — | Jun 7 – Jun 21 | — |
| Melons & Watermelon | May 3 – May 10 | Jun 14 – Jun 28 | — | — |
| Carrots | — | — | May 10 – Jun 7 | Jun 29 – Jul 13 |
| Beets | — | — | May 10 – Jun 7 | Jul 13 – Jul 27 |
| Potatoes | — | — | May 10 – May 31 | — |
| Swiss Chard | — | — | May 17 – Jun 14 | Jul 13 – Jul 27 |
| Cilantro | — | — | May 17 – Jun 7 | Jul 27 – Aug 17 |
| Green Beans | — | — | Jun 7 – Jun 28 | — |
| Sweet Corn | — | — | Jun 7 – Jun 21 | — |
| 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 14 – Jul 5 | — | — |
| Garlic | — | — | — | Sep 7 – Oct 12 |
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 Gerber Dam, OR weather station, 17 km away (elevation 4,869 ft (1,484 m)).
Frost dates near Bonanza
- Dairy Jun 9 · Sep 18
- Beatty May 31 · Sep 21
- Sprague River May 31 · Sep 21
- Malin Jun 6 · Sep 14
- Bly May 31 · Sep 21
- Merrill Jun 6 · Sep 14
- Klamath Falls Jun 9 · Sep 18
- Midland Jun 5 · Sep 20
- Chiloquin frost any month
- Keno Jun 5 · Sep 20
Frequently asked questions
When is the last frost in Bonanza, OR?
The median last spring frost in Bonanza, OR is May 31. There is still about a 10% chance of frost after June 17, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Bonanza, OR?
The median first fall frost is September 21, with about a 10% chance of frost before September 6.
How long is the growing season in Bonanza, OR?
About 113 days between the median last spring frost and first fall frost.
What planting zone is Bonanza, OR?
Bonanza, OR is in USDA hardiness zone 6b.