Summer Lake, OR frost dates
Last spring frostJun 8median date
First fall frostSep 15median date
Growing season99 daysfrost-free
Hardiness zone6bZone 6b
How Summer Lake compares
- In 8 years out of 10, the last spring frost in Summer Lake falls between May 20 and June 25, a 36-day window. The first fall frost falls between August 31 and September 28.
- The median last frost is 53 days later than the Oregon median of Apr 16.
- Its 99-day growing season is longer than 4% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 47 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 147 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 20 |
| 50% (median) | June 8 |
| 10% (safe for tender plants) | June 25 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 31 |
| 50% (median) | September 15 |
| 90% (late) | September 28 |
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 Summer Lake, OR
Summer Lake, OR frost dates — last frost Jun 8, first frost Sep 15, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Mar 16 to Mar 30Transplant outside: May 11 to May 25
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 22 to Jul 6
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 22 to Jul 6
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 15 to Jun 29
Start indoors: Apr 13 to Apr 27Transplant outside: May 18 to Jun 1Sow outdoors: May 11 to Jun 15Plant for fall: Jul 21 to Aug 18
Start indoors: Apr 13 to Apr 27Transplant outside: May 11 to May 25Sow outdoors: May 11 to May 25Plant for fall: Jul 7 to Jul 28
Start indoors: Apr 13 to Apr 27Transplant outside: May 25 to Jun 8
Start indoors: Apr 13 to Apr 27Transplant outside: May 18 to Jun 1
Start indoors: Apr 13 to Apr 27Transplant outside: May 25 to Jun 8
Start indoors: Apr 27 to May 11Transplant outside: Jun 29 to Jul 13Sow outdoors: Jun 29 to Jul 13
Start indoors: Apr 27 to May 11Transplant outside: Jun 15 to Jun 29
Sow outdoors: Apr 27 to May 18Plant for fall: Jun 23 to Jul 14
Sow outdoors: Apr 27 to May 18Plant for fall: Jul 21 to Aug 11
Sow outdoors: May 4 to Jun 15Plant for fall: Aug 4 to Aug 25
Start indoors: May 11 to May 18Transplant outside: Jun 22 to Jun 29Sow outdoors: Jun 15 to Jun 29
Start indoors: May 11 to May 18Sow outdoors: Jun 15 to Jun 29
Start indoors: May 11 to May 18Sow outdoors: Jun 15 to Jun 29
Start indoors: May 11 to May 18Transplant outside: Jun 22 to Jul 6
Sow outdoors: May 18 to Jun 15
Sow outdoors: May 18 to Jun 15Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 18 to Jun 8
Sow outdoors: May 25 to Jun 22Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 25 to Jun 15Plant for fall: Jul 21 to Aug 11
Sow outdoors: Jun 15 to Jul 6
Sow outdoors: Jun 15 to Jun 29
Transplant outside: Jun 22 to Jul 13
Plant for fall: Sep 1 to Oct 6
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Summer Lake, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 16 – Mar 30 | May 11 – May 25 | — | — |
| Peppers | Mar 30 – Apr 13 | Jun 22 – Jul 6 | — | — |
| Eggplant | Mar 30 – Apr 13 | Jun 22 – Jul 6 | — | — |
| Tomatoes | Apr 13 – Apr 27 | Jun 15 – Jun 29 | — | — |
| Lettuce | Apr 13 – Apr 27 | May 18 – Jun 1 | May 11 – Jun 15 | Jul 21 – Aug 18 |
| Kale | Apr 13 – Apr 27 | May 11 – May 25 | May 11 – May 25 | Jul 7 – Jul 28 |
| Broccoli | Apr 13 – Apr 27 | May 25 – Jun 8 | — | — |
| Cabbage | Apr 13 – Apr 27 | May 18 – Jun 1 | — | — |
| Cauliflower | Apr 13 – Apr 27 | May 25 – Jun 8 | — | — |
| Okra | Apr 27 – May 11 | Jun 29 – Jul 13 | Jun 29 – Jul 13 | — |
| Basil | Apr 27 – May 11 | Jun 15 – Jun 29 | — | — |
| Peas | — | — | Apr 27 – May 18 | Jun 23 – Jul 14 |
| Spinach | — | — | Apr 27 – May 18 | Jul 21 – Aug 11 |
| Radishes | — | — | May 4 – Jun 15 | Aug 4 – Aug 25 |
| Cucumbers | May 11 – May 18 | Jun 22 – Jun 29 | Jun 15 – Jun 29 | — |
| Zucchini & Summer Squash | May 11 – May 18 | — | Jun 15 – Jun 29 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 99 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 11 – May 18 | — | Jun 15 – Jun 29 | — |
| Melons & Watermelon | May 11 – May 18 | Jun 22 – Jul 6 | — | — |
| Carrots | — | — | May 18 – Jun 15 | — |
| Beets | — | — | May 18 – Jun 15 | Jul 7 – Jul 21 |
| Potatoes | — | — | May 18 – Jun 8 | — |
| Swiss Chard | — | — | May 25 – Jun 22 | Jul 7 – Jul 21 |
| Cilantro | — | — | May 25 – Jun 15 | Jul 21 – Aug 11 |
| Green Beans | — | — | Jun 15 – Jul 6 | — |
| Sweet Corn | — | — | Jun 15 – Jun 29 | — |
| Sweet Potatoes Warning: Your frost-free season is about 99 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 22 – Jul 13 | — | — |
| 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 Summer Lake 1 S, OR weather station, 2 km away (elevation 4,193 ft (1,278 m)).
Frost dates near Summer Lake
- Silver Lake frost any month
- Paisley Jun 6 · Sep 14
- Christmas Valley frost any month
- Fort Rock frost any month
- Bly May 31 · Sep 21
- Beatty May 31 · Sep 21
- Sprague River May 31 · Sep 21
- Chemult frost any month
- Plush frost any month
- Riley Jun 11 · Sep 28
Frequently asked questions
When is the last frost in Summer Lake, OR?
The median last spring frost in Summer Lake, OR is June 8. There is still about a 10% chance of frost after June 25, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Summer Lake, OR?
The median first fall frost is September 15, with about a 10% chance of frost before August 31.
How long is the growing season in Summer Lake, OR?
About 99 days between the median last spring frost and first fall frost.
What planting zone is Summer Lake, OR?
Summer Lake, OR is in USDA hardiness zone 6b.