Rhododendron, OR frost dates
Last spring frostMay 27median date
First fall frostOct 9median date
Growing season135 daysfrost-free
Hardiness zone7bZone 7b
How Rhododendron compares
- In 8 years out of 10, the last spring frost in Rhododendron falls between May 4 and June 14, a 41-day window. The first fall frost falls between September 18 and October 26.
- The median last frost is 41 days later than the Oregon median of Apr 16.
- Its 135-day growing season is longer than 16% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 52 days later than the zone 7b median of Apr 5. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7b chart.
- The weather station records an average of 170 nights a year at or below 32°F.
- Compared with Gresham, OR, 43 km away, the last frost here is 72 days later than there and the growing season is 114 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 4 |
| 50% (median) | May 27 |
| 10% (safe for tender plants) | June 14 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 18 |
| 50% (median) | October 9 |
| 90% (late) | October 26 |
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 Rhododendron, OR
Rhododendron, OR frost dates — last frost May 27, first frost Oct 9, zone 7b. whenisthelastfrost.com
Crop
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Start indoors: Mar 4 to Mar 18Transplant outside: Apr 29 to May 13
Start indoors: Mar 18 to Apr 1Transplant outside: Jun 10 to Jun 24
Start indoors: Mar 18 to Apr 1Transplant outside: Jun 10 to Jun 24
Start indoors: Apr 1 to Apr 15Transplant outside: Jun 3 to Jun 17
Start indoors: Apr 1 to Apr 15Transplant outside: May 6 to May 20Sow outdoors: Apr 29 to Jun 3Plant for fall: Aug 14 to Sep 11
Start indoors: Apr 1 to Apr 15Transplant outside: Apr 29 to May 13Sow outdoors: Apr 29 to May 13Plant for fall: Jul 31 to Aug 21
Start indoors: Apr 1 to Apr 15Transplant outside: May 13 to May 27Plant for fall: Jul 3 to Jul 24
Start indoors: Apr 1 to Apr 15Transplant outside: May 6 to May 20Plant for fall: Jul 3 to Jul 24
Start indoors: Apr 1 to Apr 15Transplant outside: May 13 to May 27Plant for fall: Jul 3 to Jul 24
Start indoors: Apr 15 to Apr 29Transplant outside: Jun 17 to Jul 1Sow outdoors: Jun 17 to Jul 1
Start indoors: Apr 15 to Apr 29Transplant outside: Jun 3 to Jun 17
Sow outdoors: Apr 15 to May 6Plant for fall: Jul 17 to Aug 7
Sow outdoors: Apr 15 to May 6Plant for fall: Aug 14 to Sep 4
Sow outdoors: Apr 22 to Jun 3Plant for fall: Aug 28 to Sep 18
Start indoors: Apr 29 to May 6Transplant outside: Jun 10 to Jun 17Sow outdoors: Jun 3 to Jun 17Plant for fall: Jul 24 to Aug 7
Start indoors: Apr 29 to May 6Sow outdoors: Jun 3 to Jun 17Plant for fall: Jul 31 to Aug 14
Start indoors: Apr 29 to May 6Sow outdoors: Jun 3 to Jun 17
Start indoors: Apr 29 to May 6Transplant outside: Jun 10 to Jun 24
Sow outdoors: May 6 to Jun 3Plant for fall: Jul 17 to Jul 31
Sow outdoors: May 6 to Jun 3Plant for fall: Jul 31 to Aug 14
Sow outdoors: May 6 to May 27
Sow outdoors: May 13 to Jun 10Plant for fall: Jul 31 to Aug 14
Sow outdoors: May 13 to Jun 3Plant for fall: Aug 14 to Sep 4
Sow outdoors: Jun 3 to Jun 24Plant for fall: Jul 24 to Aug 7
Sow outdoors: Jun 3 to Jun 17
Transplant outside: Jun 10 to Jul 1
Plant for fall: Sep 25 to Oct 30
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Rhododendron, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 4 – Mar 18 | Apr 29 – May 13 | — | — |
| Peppers | Mar 18 – Apr 1 | Jun 10 – Jun 24 | — | — |
| Eggplant | Mar 18 – Apr 1 | Jun 10 – Jun 24 | — | — |
| Tomatoes | Apr 1 – Apr 15 | Jun 3 – Jun 17 | — | — |
| Lettuce | Apr 1 – Apr 15 | May 6 – May 20 | Apr 29 – Jun 3 | Aug 14 – Sep 11 |
| Kale | Apr 1 – Apr 15 | Apr 29 – May 13 | Apr 29 – May 13 | Jul 31 – Aug 21 |
| Broccoli | Apr 1 – Apr 15 | May 13 – May 27 | — | Jul 3 – Jul 24 |
| Cabbage | Apr 1 – Apr 15 | May 6 – May 20 | — | Jul 3 – Jul 24 |
| Cauliflower | Apr 1 – Apr 15 | May 13 – May 27 | — | Jul 3 – Jul 24 |
| Okra | Apr 15 – Apr 29 | Jun 17 – Jul 1 | Jun 17 – Jul 1 | — |
| Basil | Apr 15 – Apr 29 | Jun 3 – Jun 17 | — | — |
| Peas | — | — | Apr 15 – May 6 | Jul 17 – Aug 7 |
| Spinach | — | — | Apr 15 – May 6 | Aug 14 – Sep 4 |
| Radishes | — | — | Apr 22 – Jun 3 | Aug 28 – Sep 18 |
| Cucumbers | Apr 29 – May 6 | Jun 10 – Jun 17 | Jun 3 – Jun 17 | Jul 24 – Aug 7 |
| Zucchini & Summer Squash | Apr 29 – May 6 | — | Jun 3 – Jun 17 | Jul 31 – Aug 14 |
| Winter Squash & Pumpkins | Apr 29 – May 6 | — | Jun 3 – Jun 17 | — |
| Melons & Watermelon | Apr 29 – May 6 | Jun 10 – Jun 24 | — | — |
| Carrots | — | — | May 6 – Jun 3 | Jul 17 – Jul 31 |
| Beets | — | — | May 6 – Jun 3 | Jul 31 – Aug 14 |
| Potatoes | — | — | May 6 – May 27 | — |
| Swiss Chard | — | — | May 13 – Jun 10 | Jul 31 – Aug 14 |
| Cilantro | — | — | May 13 – Jun 3 | Aug 14 – Sep 4 |
| Green Beans | — | — | Jun 3 – Jun 24 | Jul 24 – Aug 7 |
| Sweet Corn | — | — | Jun 3 – Jun 17 | — |
| Sweet Potatoes | — | Jun 10 – Jul 1 | — | — |
| Garlic | — | — | — | Sep 25 – Oct 30 |
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 Government Camp, OR weather station, 14 km away (elevation 3,980 ft (1,213 m)).
Frost dates near Rhododendron
- Welches May 27 · Oct 9
- Brightwood Mar 27 · Nov 18
- Government Camp May 27 · Oct 9
- Sandy Mar 27 · Nov 18
- Mount Hood Parkdale May 13 · Oct 3
- Bridal Veil Apr 29 · Oct 22
- Corbett Mar 27 · Nov 18
- Estacada Mar 27 · Nov 14
- Eagle Creek Mar 27 · Nov 14
- Cascade Locks Mar 24 · Nov 20
Frequently asked questions
When is the last frost in Rhododendron, OR?
The median last spring frost in Rhododendron, OR is May 27. There is still about a 10% chance of frost after June 14, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Rhododendron, OR?
The median first fall frost is October 9, with about a 10% chance of frost before September 18.
How long is the growing season in Rhododendron, OR?
About 135 days between the median last spring frost and first fall frost.
What planting zone is Rhododendron, OR?
Rhododendron, OR is in USDA hardiness zone 7b.