Frost Dates: First and last frost dates for O O Rch, OR
ℹ️ How to read these charts for the spring
As spring unfolds, the risk of frost gradually decreases each day until your tender plants are finally safe. The probabilities shown in the chart help you make smart decisions about when to plant.
While frost typically forms at 32°F, tender plants can be damaged even when temperatures are slightly higher. Air temperatures are often measured several feet above the ground, but temperatures at plant level can be several degrees colder. Protected areas like porches help by blocking radiational cooling. Given these variables, we consider 36°F the "caution zone" for frost-sensitive plants.
Key dates for your spring planting:
- By June 3, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around May 18, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before May 7, there's still an 80% risk of frost — too early for tomatoes and other tender plants unless you're prepared to protect them
If the 10-day forecast shows no temperatures below 40°F, you might safely plant earlier than the above dates suggest. Many gardeners watch for this weather window to get a head start on the growing season.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| Last 16° | Jan 28 | Jan 15 | Jan 3 | Dec 21 | -- | -- | -- | -- | -- |
| Last 20° | Feb 16 | Feb 4 | Jan 26 | Jan 17 | Jan 8 | Dec 25 | -- | -- | -- |
| Last 24° | Feb 19 | Feb 10 | Feb 4 | Jan 30 | Jan 25 | Jan 19 | Jan 12 | Dec 29 | -- |
| Last 28° | Apr 5 | Mar 23 | Mar 14 | Mar 7 | Feb 27 | Feb 20 | Feb 12 | Feb 3 | Jan 22 |
| Last 32° | May 11 | May 4 | Apr 29 | Apr 25 | Apr 20 | Apr 16 | Apr 12 | Apr 7 | Mar 31 |
| Last 36° | Jun 3 | May 28 | May 24 | May 21 | May 18 | May 14 | May 11 | May 7 | May 1 |
ℹ️ How to read these charts for the fall
As summer ends in O O Rch, OR, nighttime temperatures begin to drop, and your risk of frost increases with each passing day. Knowing when to expect frost helps you harvest sensitive crops and extend your growing season with protection methods.
The chart below shows the probability of experiencing specific temperatures on various dates. Here's what this means for your garden:
These probabilities help you time your end-of-season harvests and know when to apply protective measures like row covers, cloches, or cold frames to extend your harvest.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| First 16° | Dec 16 | Dec 30 | Jan 10 | Jan 23 | -- | -- | -- | -- | -- |
| First 20° | Dec 2 | Dec 16 | Dec 28 | Jan 8 | Jan 20 | Feb 7 | -- | -- | -- |
| First 24° | Nov 19 | Dec 2 | Dec 12 | Dec 20 | Dec 29 | Jan 7 | Jan 18 | Feb 8 | -- |
| First 28° | Oct 22 | Nov 2 | Nov 10 | Nov 16 | Nov 22 | Nov 28 | Dec 5 | Dec 13 | Dec 23 |
| First 32° | Oct 4 | Oct 12 | Oct 18 | Oct 23 | Oct 27 | Nov 1 | Nov 6 | Nov 12 | Nov 20 |
| First 36° | Sep 23 | Sep 28 | Oct 2 | Oct 5 | Oct 9 | Oct 12 | Oct 15 | Oct 19 | Oct 24 |
📍 Frost Dates for other nearby locations
- Salem Ap Mcnary Fld, OR 23.4 mi
- Corvallis Water Bureau, OR 24.3 mi
- Stayton, OR 25.1 mi
- Dallas, OR 27.7 mi
- Falls City #2, OR 28.8 mi
- Eugene-mahlon Sweet Fld, OR 32.6 mi
- Foster Dam, OR 32.8 mi
- Silverton, OR 37.4 mi
- Silver Creek Falls, OR 37.8 mi
- Fern Ridge-veneta, OR 41.2 mi
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Data is provided by the NOAA National Centers for Environmental Information.