Frost dates for 84102Salt Lake City, UT
The average last spring frost in Salt Lake City is April 24 and the average first fall frost is October 19, giving a typical growing season of about 178 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 24
- Average first fall frost
- Oct 19
- Growing season
- 178 days
Safer after May 14 (1-in-10 risk)
Possible by Oct 5 (1-in-10 risk)
Last frost typically in 179 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 23 · May 9 · Jun 1 | Sep 28 · Oct 9 · Oct 22 | 152 days | 100% |
| Frost / freeze (32°F) | Apr 5 · Apr 24 · May 14 | Oct 5 · Oct 19 · Nov 4 | 178 days | 100% |
| Hard freeze (28°F) | Mar 15 · Apr 7 · Apr 28 | Oct 16 · Nov 1 · Nov 17 | 208 days | 100% |
Planting calendar for Salt Lake City
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 24 – May 30 |
| Tomatoes | Transplant outdoors | May 10 – Jun 29 |
| Peppers | Start seeds indoors | Mar 24 – Apr 24 |
| Peppers | Transplant outdoors | May 24 – Jun 24 |
| Eggplant | Start seeds indoors | Apr 10 – May 9 |
| Eggplant | Transplant outdoors | May 24 – Jun 24 |
| Cucumbers | Sow outdoors | May 24 – Jul 9 |
| Summer squash | Sow outdoors | May 10 – Jun 24 |
| Winter squash & pumpkins | Sow outdoors | May 24 – Jun 24 |
| Snap beans | Sow outdoors | May 10 – Aug 1 |
| Sweet corn | Sow outdoors | May 10 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 24 – Jun 24 |
| Okra | Sow outdoors | May 17 – Jun 9 |
| Peas | Sow outdoors (spring) | Mar 24 – May 9 |
| Potatoes | Plant outdoors (spring) | Mar 24 – May 24 |
| Onions | Start seeds indoors (spring) | Feb 10 – Mar 9 |
| Onions | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (spring) | Mar 6 – Apr 9 |
| Broccoli | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 24 – Mar 24 |
| Cabbage | Transplant outdoors (spring) | Mar 24 – Apr 24 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 24 – Jun 9 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 17 – Apr 30 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 24 – May 14 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 10 – Apr 30 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 24 – Jun 9 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 84102 is matched to the NOAA station Bountiful-Val Verda, UT, 10.8 km away, at 4,540 ft elevation (124 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Bountiful-Val Verda, UT (used) | 4,540 ft | Apr 24 | Oct 19 |
| Salt Lake Triad Ctr, UT | 4,280 ft | Mar 31 | Nov 8 |
| Salt Lake City E Bench, UT | 4,850 ft | Apr 25 | Oct 18 |
| City Creek Wtp, UT | 5,340 ft | May 13 | Oct 7 |
Frost dates near Salt Lake City
- Salt Lake City, UT 84111 · last Apr 8, first Oct 31
- North Salt Lake, UT 84054 · last Apr 8, first Oct 31
- Sandy, UT 84090 · last Apr 8, first Oct 31
- Bountiful, UT 84010 · last Apr 24, first Oct 19
- West Valley City, UT 84119 · last Apr 8, first Oct 31
- Woods Cross, UT 84087 · last Apr 24, first Oct 19
- Midvale, UT 84047 · last Apr 18, first Oct 22
- West Jordan, UT 84084 · last Apr 18, first Oct 22
Frequently asked questions
- When is the last frost in Salt Lake City, UT?
- For ZIP code 84102, the average last spring frost (32°F) is April 24, based on NOAA 1991-2020 climate normals for the Bountiful-Val Verda, UT weather station. There is a 1-in-10 chance of a frost after May 14.
- When is the first frost in Salt Lake City, UT?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 5, so tender plants are at risk from that point on.
- How long is the growing season in 84102?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 178 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.